Respuesta :

michelle106
3x +12 = 18
-12 -12
---------------
3x 6
-- = --
3 3
x = 2
caylus
Hello,

if 3x+12>0 then |3x+12|=3x+12
so 3x+12=18==>3x=6==>x=2

if 3x+12<0 then |3x+12|=-(3x+12)=-3x-12
so -3x-12=18 ==>-3x=30==>x=-10

Two solutions!