21=-3/5u

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Solution for 21=-3/5u equation: 


u in (-oo:+oo)

21 = (-3/5)*u // - (-3/5)*u

21-((-3/5)*u) = 0

(3/5)*u+21 = 0

3/5*u+21 = 0 // - 21

3/5*u = -21 // : 3/5

u = -21/3/5

u = -35

u = -35

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