Respostas

2013-08-30T15:33:22-03:00
A)10x-5 = 12 + 6 -x
10x +x  = 18 +5
11x= 23
x= 23/11
b)x+12+15 = x+3x+9
x +x +3x = 9 -12-15
5x = 9 - 27
5x = -18
x = -18/5
17x1???(se tiver multiplicando)
17x = 12x - 4
17x - 12x = 4
5x = 4
x=4/5

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