-21=-7/4y

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Solution for -21=-7/4y equation: 


y in (-oo:+oo)

-21 = (-7/4)*y // - (-7/4)*y

-((-7/4)*y)-21 = 0

(7/4)*y-21 = 0

7/4*y-21 = 0 // + 21

7/4*y = 21 // : 7/4

y = 21/7/4

y = 12

y = 12

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