21=-3/5y

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Solution for 21=-3/5y equation: 


y in (-oo:+oo)

21 = (-3/5)*y // - (-3/5)*y

21-((-3/5)*y) = 0

(3/5)*y+21 = 0

3/5*y+21 = 0 // - 21

3/5*y = -21 // : 3/5

y = -21/3/5

y = -35

y = -35

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