-y/9=21

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Solution for -y/9=21 equation: 


y in (-oo:+oo)

-y/9 = 21 // - 21

-y/9-21 = 0

-1/9*y-21 = 0 // + 21

-1/9*y = 21 // : -1/9

y = 21/(-1/9)

y = -189

y = -189

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