Respostas

2014-08-14T10:56:12-03:00
a) 3-2.(x+3)= x-18
 3-2x-6=x-18
-2x-x=-18-3+6
-3x=-15 .(-1)
x=15/3
x=5

b) 50+(3x-4)=2.(3x-4)+26
 50+3x-4=6x-8+26
3x-6x=26-8+4-50
-3x=18-46
-3x=-28 .(-1)
x=28/3
x=9,3333...