-9=-3/7z

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Solution for -9=-3/7z equation: 


z in (-oo:+oo)

-9 = (-3/7)*z // - (-3/7)*z

-((-3/7)*z)-9 = 0

(3/7)*z-9 = 0

3/7*z-9 = 0 // + 9

3/7*z = 9 // : 3/7

z = 9/3/7

z = 21

z = 21

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