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

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

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

y = -21/(-3/5)

y = 35

y = 35

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