21=-7/5y

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Solution for 21=-7/5y equation: 


y in (-oo:+oo)

21 = (-7/5)*y // - (-7/5)*y

21-((-7/5)*y) = 0

(7/5)*y+21 = 0

7/5*y+21 = 0 // - 21

7/5*y = -21 // : 7/5

y = -21/7/5

y = -15

y = -15

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