-12=-4/7z

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Solution for -12=-4/7z equation: 


z in (-oo:+oo)

-12 = (-4/7)*z // - (-4/7)*z

-((-4/7)*z)-12 = 0

(4/7)*z-12 = 0

4/7*z-12 = 0 // + 12

4/7*z = 12 // : 4/7

z = 12/4/7

z = 21

z = 21

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