Question

1)13х+9х+13=321 2)(х-42)*13=390 3)(7х-х)÷5=180

Answer 1

1) 13х + 9х + 13 = 321
Combining like terms, we get:
22х + 13 = 321
Subtracting 13 from both sides, we get:
22х = 308
Dividing both sides by 22, we get:
х = 14

2) (х-42) * 13 = 390
Expanding the left side, we get:
13х - 546 = 390
Adding 546 to both sides, we get:
13х = 936
Dividing both sides by 13, we get:
х = 72

3) (7х - х) ÷ 5 = 180
Combining like terms, we get:
6х ÷ 5 = 180
Multiplying both sides by 5, we get:
6х = 900
Dividing both sides by 6, we get:
х = 150

Answer 2

Let's solve each of these equations step by step:

1. 13x + 9x + 13 = 321 Combine like terms on the left side of the equation: (13x + 9x) + 13 = 321 22x + 13 = 321

Subtract 13 from both sides to isolate the variable: 22x = 321 - 13 22x = 308

Now, divide both sides by 22 to solve for x: x = 308 / 22 x = 14

So, the solution to the first equation is x = 14.

2. (x - 42) * 13 = 390 First, distribute the 13 on the left side of the equation: 13x - 13 * 42 = 390 13x - 546 = 390

Add 546 to both sides to isolate the variable: 13x = 390 + 546 13x = 936

Now, divide both sides by 13 to solve for x: x = 936 / 13

x = 72

So, the solution to the second equation is x = 72.

3. (7x - x) ÷ 5 = 180 Combine like terms on the left side of the equation: (7x - x) ÷ 5 = 180 6x ÷ 5 = 180

Multiply both sides by 5 to isolate the variable: 6x = 180 * 5 6x = 900

Now, divide both sides by 6 to solve for x: x = 900 / 6 x = 150

So, the solution to the third equation is x = 150.