Respostas

2014-08-22T22:39:18-03:00
10+2x= - 10
2x= -10 -10
2x=-20 
x= -20 /2 = -10 
30-20 = 10 por isso os 10+2x= - 10
brigada
:))
2014-08-22T22:39:31-03:00
2X=20-30-10
2x=20-40
2x=-20
X= \frac{-20}{2}

X = -10
1 4 1