21=3/7y

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Solution for 21=3/7y equation: 


y in (-oo:+oo)

21 = (3/7)*y // - (3/7)*y

21-((3/7)*y) = 0

(-3/7)*y+21 = 0

21-3/7*y = 0 // - 21

-3/7*y = -21 // : -3/7

y = -21/(-3/7)

y = 49

y = 49

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