3) x-1=7 (x-1) я 4) x-2=1+4x 5) 5x+5=5 (x-1)

3) х-1 = 7 (х-1)

х-1=7 х-7

х-7 х = - 7+1

- 6 х = - 6

х = - 6: ( - 6) = 6:6

х=1

Ответ: х=1

4) х-2 = 1+4 х

х - 4 х = 1+2

- 3 х=3

х = 3: ( - 3)

х = - 1

Ответ: х = - 1

5) 5 х+5 = 5 (х-1)

5 х+5=5 х-5

5 х-5 х = - 5 - 5

0 х = - 10

х = - 10: 0

х = 0

Ответ: х=0

Вот помогла

3) х - 1 = 7 (х - 1). 4) x - 2 = 1 + 4x.

x - 1 = 7x - 7 x - 4x = 1 + 2

x - 7x = 1 - 7 - 3x = 3

-6x = - 6. x = 3 : (-3)

x = - 6 : (-6). x = - 1

x = 1

5) 5x + 5 = 5 (x - 1)

5x + 5 = 5x - 5

5x - 5x = - 5 - 5

x = - 10 x = - 10 : 0 x = 0