Question

1) 3(x - 4) = x; 3) 5(x - 2) = 2x; 5) 3(-x - 1) = -(2x + 3);​

Answer 1

1) 3(x - 4) = x

3х - 12 = х

3х - х = 12

2х = 12

х = 6

Ответ: 6

3) 5(x - 2) = 2x

5х - 10 = 2х

5х - 2х = 10

3х = 10

х = 3 $\frac{1}{3}$

Ответ: 3 $\frac{1}{3}$

5) 3(-x - 1) = -(2x + 3)

-3х - 3 = -2х - 3

-3х + 2х = -3 + 3

1х = 0

х = 0

Ответ: 0

Answer 2

1)

3(x - 4) = x

3х-3×4

3х-12

3х-12=х

3х=х+12

2х=12

2х÷2=12÷2

х=12÷2

х=6

2)

5(x - 2) = 2x

5х-10=2х

5х=2х+10

5х-2х=10

3х=10

3х÷3=10÷3

х=10÷3

х=3,3

3)

3(-x - 1) = -(2x + 3)

-3х-3=-(2х+3)

-3х-3=-2х-3

-3х=-2х

-3х+2х=0

(-3+2)х

-1х

х=0