Respostas

2014-08-20T00:50:19-03:00
39- X+966+X+98+X=1490
3X=1490 - 1064
3X=426
X=142
40- (x+1).3 = x + 37
3x+3=x+37
3x-x=37-3
2x=34
x=34/2
x=17