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

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

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

y = -21/(-7/5)

y = 15

y = 15

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