Calcule x, sabendo que a//b//c.... Pergunta de ideia degabrielcarvalho5

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Calcule x, sabendo que a//b//c

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kjmaneiro A)
$\frac{2x-2}{3x+1} = \frac{4}{7}$

$7(2x-2)=4(3x+1)$

$14x-14=12x+4$

$14x-12x=4+14$

$2x=18$

$x=18\div2$

$x=9$

b)

$\frac{6}{x} = \frac{4}{1,8}$

$4x=6\times1,8$

$4x=10,8$

$x=10,8\div4$

$x=2,7$

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kjmaneiro OK!

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