12/21=y/13

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Solution for 12/21=y/13 equation: 


y in (-oo:+oo)

12/21 = y/13 // - y/13

12/21-(y/13) = 0

4/7-1/13*y = 0 // - 4/7

-1/13*y = -4/7 // : -1/13

y = -4/7/(-1/13)

y = 52/7

y = 52/7

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