Respostas

2014-08-07T22:28:02-03:00
A) 5(x-4)=2x+4
5x-20=2x+4
5x-2x=4+20
3x=24
x=8
B) 2x+5=8(x-3)+5
2x+5=8x-24+5
2x-8x=-24
-6x=-24 x(-1)
x=4
C) 5x+5 = 4(x+2)+5
5x+5=4x+8+5
5x-4x=13-5
x=8
D) 5x-5=4x-8+5
5x-4x=-8+5-5
x=-8
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