Respostas

2013-09-01T12:48:17-03:00
2(x/5 + 1/4)=3/8
2( 4x+5/20) = 3/8
8x+10/20= 3/8
64x+80=60
64x=60-80
64x= -20
x= -20/64
x= -5/16