-9=u/7

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Solution for -9=u/7 equation: 


u in (-oo:+oo)

-9 = u/7 // - u/7

-(u/7)-9 = 0

-1/7*u-9 = 0 // + 9

-1/7*u = 9 // : -1/7

u = 9/(-1/7)

u = -63

u = -63

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