П-56 решите уравнение и сделайте проверку

Пошаговое объяснение:

a)

-2*(x - 1)+3x = 7

-2x + 2 + 3x = 7

x + 2 = 7

x = 7 - 2

x = 5

-2*(5 - 1) + 3*5 = 7

-2*4 + 15 = 7

-8 + 15 = 7

7 = 7

б)

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

5y - 3 + y + 2y - 1 = y + 3

8y - 4 = y + 3

8y - y = 3 + 4

7y = 7

y = 7:7

y = 1

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

5 - 2 + 1 = 4

4 = 4

2*(x - 5) - 3*(x + 4) = x - 22

2x - 10 - 3x - 12 = x - 22

-x - 22 = x - 22

x + x = -22 + 22

2x = 0

x = 0

a)

-3*(x - 2) + 4x = 11

-3x + 6 + 4x = 11

x + 6 = 11

x = 11 - 6

x = 5

-3*(5 - 2) + 4*5 = 11

-3*3 + 20 = 11

-9 + 20 = 11

11 = 11

б)

2y - (4 - y) + (3y - 2) = y + 4

2y - 4 + y + 3y - 2 = y + 4

6y - 6 = y + 4

6y - y = 4 + 6

5y = 10

y = 10 : 5

y = 2

2*2- (4 - 2) + (3*2 - 2) = 2 + 4

4 - 2 + 4 = 6

6 = 6

3 *(x - 4) - 4*(x + 5) = -30 + x

3x - 12 - 4x - 20 = -30 + x

-x - 32 = -30 + x

x + x = -32 + 30

2x = -2

x = -2 : 2

x = -1