2*x=12-4*x
3*x+8=7*x-4
4*x+7+5*x=6*x+12+2*x
HELPPP!


Odpowiedź :

1)

2x = 12 - 4x

2x + 4x = 12

6x = 12   /:6

x = 2

2)

3x + 8 = 7x - 4

3x - 7x = -4 - 8

-4x = -12   /:(-4)

x = 3

3)

4x + 7 + 5x = 6x + 12 + 2x

9x + 7 = 8x + 12

9x - 8x = 12 - 7

x = 5