42=7/5u

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Solution for 42=7/5u equation: 


u in (-oo:+oo)

42 = (7/5)*u // - (7/5)*u

42-((7/5)*u) = 0

(-7/5)*u+42 = 0

42-7/5*u = 0 // - 42

-7/5*u = -42 // : -7/5

u = -42/(-7/5)

u = 30

u = 30

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