-9=y/7

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Solution for -9=y/7 equation: 


y in (-oo:+oo)

-9 = y/7 // - y/7

-(y/7)-9 = 0

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

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

y = 9/(-1/7)

y = -63

y = -63

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