Question

Б)27-4х=х+31 в)7х+5=0 г)3х-(7х-2)=18 решите уравнение

Answer 1

Объяснение:

27-4х=х+31

-4х+х=31-27

-3х=4

х=-4/3

7х+5=0

7х=0-5

7х=-5

х=-5/7

3х-(7х-2)=18

3х-7х+2=18

-4х=18-2

-4х=16

х=-4

Answer 2

a) To solve the equation 27-4x = x+31, we can simplify it by collecting like terms:

27 - 4x = x + 31

First, let's get rid of the x term on the right side by subtracting x from both sides:

27 - 4x - x = x - x + 31

27 - 5x = 31

Next, let's isolate the x term by subtracting 27 from both sides:

27 - 5x - 27 = 31 - 27

-5x = 4

Finally, divide both sides by -5 to solve for x:

-5x / -5 = 4 / -5

x = -4/5

Therefore, the solution to the equation is x = -4/5.

b) To solve the equation 7x + 5 = 0, we can isolate the x term:

7x + 5 = 0

Subtracting 5 from both sides:

7x + 5 - 5 = 0 - 5

7x = -5

Finally, divide both sides by 7 to solve for x:

7x / 7 = -5 / 7

x = -5/7

Therefore, the solution to the equation is x = -5/7.

c) To solve the equation 3x - (7x - 2) = 18, we need to simplify the expression within the parentheses first:

3x - (7x - 2) = 18

Distribute the negative sign:

3x - 7x + 2 = 18

Combine like terms:

-4x + 2 = 18

Subtract 2 from both sides:

-4x + 2 - 2 = 18 - 2

-4x = 16

Finally, divide both sides by -4 to solve for x:

-4x / -4 = 16 / -4

x = -4

Therefore, the solution to the equation is x = -4.