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

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

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

y = -21/3/4

y = -28

y = -28

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