3/5=4/7y

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Solution for 3/5=4/7y equation: 


y in (-oo:+oo)

3/5 = (4/7)*y // - (4/7)*y

3/5-((4/7)*y) = 0

(-4/7)*y+3/5 = 0

3/5-4/7*y = 0 // - 3/5

-4/7*y = -3/5 // : -4/7

y = -3/5/(-4/7)

y = 21/20

y = 21/20

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