21=-3/2y

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Solution for 21=-3/2y equation: 


y in (-oo:+oo)

21 = (-3/2)*y // - (-3/2)*y

21-((-3/2)*y) = 0

(3/2)*y+21 = 0

3/2*y+21 = 0 // - 21

3/2*y = -21 // : 3/2

y = -21/3/2

y = -14

y = -14

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