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

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

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

u = -42/7/5

u = -30

u = -30

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