21=3/4y

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Solution for 21=3/4y equation: 


y in (-oo:+oo)

21 = (3/4)*y // - (3/4)*y

21-((3/4)*y) = 0

(-3/4)*y+21 = 0

21-3/4*y = 0 // - 21

-3/4*y = -21 // : -3/4

y = -21/(-3/4)

y = 28

y = 28

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