-4x=-20 x=5
3x + 12=7x - 8 => 3x - 7x =-8 - 12 => -4x=-20 => x=-20/-4 => x=5
3x+12=7x-8
3x-7x=-12-8
-4x=-20
x=5
x+2
5+2=7
3x + 12 = 7x - 8
3x + 2 = 7x - 8 x + 2 = 5+2
3x - 7x = -8 - 12 =7
-4x = -20
x =-20 : (-4)
x = 5

Jawabanmu

2014-02-16T11:54:02+07:00
3x+12 = 7x-8
15x = -1
x = 15/-1
x = -15

gitu? gajago matematika uh
2014-02-16T11:54:38+07:00