Question

12x-3=9   7x+11=4  3x+7=x-2   8x-(3x+1)=9

Answer 1

1)12х-3=9 Переносим 3 с противоположным знаком
12х=9+3
12х=12 делим обе части на 12
 х=1
2) 7х+11=4 Переносим 11 с противоположным знаком
7х=4-11
7х=7 делим обе части на 7
х=1
3) 3х+7=х-2
3х-х=-2-7
2х=-9 делим обе части на 2
х= -4,5
4)8х-(3х+1)=9 Раскрываем скобки
8х-3х-1=9 Переносим -1 с противоположным знаком
5х=9+1
5х=10 делим обе части на 5
х=2

Answer 2

1.   12x-3=9          2.    7x+11=4             3.   3x+7=x-2         
      12х=9+3                7х=4-11                    3х-х=-2-7       
      12х=12                  7х=-7                        2х=-9                  
       х=1                        х=-1                        х=-4.5

Answer 3

Let's solve each equation step by step:

1. 12x - 3 = 9

To isolate x, we'll first add 3 to both sides:

12x - 3 + 3 = 9 + 3

This simplifies to:

12x = 12

Now, divide both sides by 12:

12x / 12 = 12 / 12

This simplifies to:

x = 1

Therefore, the solution for the first equation is x = 1.

2. 7x + 11 = 4

To isolate x, we'll first subtract 11 from both sides:

7x + 11 - 11 = 4 - 11

This simplifies to:

7x = -7

Now, divide both sides by 7:

7x / 7 = -7 / 7

This simplifies to:

x = -1

Therefore, the solution for the second equation is x = -1.

3. 3x + 7 = x - 2

First, let's subtract x from both sides:

3x - x + 7 = x - x - 2

This simplifies to:

2x + 7 = -2

Next, subtract 7 from both sides:

2x + 7 - 7 = -2 - 7

This simplifies to:

2x = -9

Finally, divide both sides by 2:

2x / 2 = -9 / 2

This simplifies to:

x = -9/2 or -4.5

Therefore, the solution for the third equation is x = -9/2 or -4.5.

4. 8x - (3x + 1) = 9

First, simplify the expression inside the parentheses:

8x - 3x - 1 = 9

Combine like terms:

5x - 1 = 9

Next, add 1 to both sides:

5x - 1 + 1 = 9 + 1

This simplifies to:

5x = 10

Now, divide both sides by 5:

5x / 5 = 10 / 5

This simplifies to:

x = 2

Therefore, the solution for the fourth equation is x = 2.

To summarize the solutions:

Equation 1: x = 1 Equation 2: x = -1 Equation 3: x = -9/2 or -4.5 Equation 4: x = 2