rozwiąż równania a)3x-8-8x=12 b)-7x+3=24 c)2x-2+7=x+5​

Odpowiedź :

a) 3x - 8 - 8x = 12

-5x - 8 = 12

-5x = 12 + 8

-5x = 20     /:(-5)

x = -4

b) -7x + 3 = 24

-7x = 24 - 3

-7x = 21       /:(-7)

x = -3

c) 2x - 2 + 7 = x + 5

2x + 5 = x + 5

2x - x = 5 - 5

x = 0

Odpowiedź:

a)

3*x-(8*x)-8 = 12       / - 12

3*x-(8*x)-12-8 = 0

3*x-8*x-12-8 = 0

-5*x-20 = 0            / + 20

-5*x = 20               / : -5

x = 20/(-5)

x = -4

b)

3-7*x = 24        / - 24

3-7*x-24 = 0

-7*x-21 = 0       / + 21

-7*x = 21           / : -7

x = 21/(-7)

x = -3

c)

2*x-2+7 = x+5           / - x+5

2*x-x-5-2+7 = 0

x = 0