Question

7x+5=4x-5
4(3x-2)=5x+9
x-5(3x-5)=-10x+2
помогите, пожалуйста

Answer 1

7x+5 = 4x-5

7x-4x = -5-5

3x = -10

x = -10/3

x = -3 1/3 (минус 3 целых 1 третья)

4(3x-2) = 5x+9

4*3x-4*2 = 5x+9

12x-8 = 5x+9

12x-5x = 9+8

7x = 17

x = 17/7

x = 2 3/7 (2 целых 3 седьмых)

x-5(3x-5) = -10x+2

x-5*3x+5*5 = -10x+2

x-15x+25 = -10x+2

-14x+10x = 2-25

-4x = -23

4x = 23

x = 23/4

x = 5,75