Respostas

2014-07-31T23:24:38-03:00
A) X+8x/2= 30-(2x-12)/2 X+8x=30+2x+12 9x-2x=42 7x=42 X=42/7 X=6 B) 2(2x-4)=5-(x/2+4) 4x-8=5-x/2-4 4x+x/2=1+8 8x+1x/2 =9 8x+x=18 9x=18 X=2
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