15 Pontos Calcule o valor de x nas proporções:
a) 6/x = 9/12
b) 2x/3= -24/15
c) 3/4= 5x/20
d)x+3/4= 12/6
a) 6/x = 9/12
b) 2x/3= -24/15
c) 3/4= 5x/20
d)x+3/4= 12/6
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