-21=-7/9y

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Solution for -21=-7/9y equation: 


y in (-oo:+oo)

-21 = (-7/9)*y // - (-7/9)*y

-((-7/9)*y)-21 = 0

(7/9)*y-21 = 0

7/9*y-21 = 0 // + 21

7/9*y = 21 // : 7/9

y = 21/7/9

y = 27

y = 27

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