Respostas

2014-05-24T03:30:27-03:00
2x-(3/10 : 7/10) = 3x - (4/10 : 6/10)
2x- (3/10 * 10/7) = 3x - (4/10 * 10/6)
2x- (3/7) = 3x- (4/6)
2x-3/7= 3x-2/3
2x-3x= -2/3+3/7
-x= -5/21  (-1)
x= 5/21
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