Respostas

2014-06-16T22:37:32-03:00
A) -10+4-2x=-4x-7
-2x+4x=-7+10- 4
2x=-1
--- --- (2x/2 =-1/2)
2 2
x = -1/2
b) 2-4x=32-18x+12
-4x+18x=32+12-2
14x=42
--- ---
14 14
x= 3
c) 2x+3=9
2x=9-3
2x=6
-- --
2 2
x= 3
d) 3x+7+x+3
4x+10