12=3/7*u

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Solution for 12=3/7*u equation: 


u in (-oo:+oo)

12 = (3/7)*u // - (3/7)*u

12-((3/7)*u) = 0

(-3/7)*u+12 = 0

12-3/7*u = 0 // - 12

-3/7*u = -12 // : -3/7

u = -12/(-3/7)

u = 28

u = 28

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