Question

2x + 12 = 3(x-7)

Answer 1

2x+12=3(x-7)

2x+12=3x-21

<=>x=33

Vậy x=33

Answer 2

2x + 12 = 3(x-7)

2x + 12 = 3x - 3.7

2x + 12 = 3x - 21

2x - 3x  = -21 - 12

(2-3)x    = -33

-1x        = -33

   x        = -33.(-1)

   x        = 33

Answer 3

Neu khong tin co the thu lai la:

Thay x=33

Ta co

2.33+12=3(33-7)

66   +12=3.26

78        =78

Vay x thoa man de bai la bang 33

Gio tin chua