20=-4/7u

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Solution for 20=-4/7u equation: 


u in (-oo:+oo)

20 = (-4/7)*u // - (-4/7)*u

20-((-4/7)*u) = 0

(4/7)*u+20 = 0

4/7*u+20 = 0 // - 20

4/7*u = -20 // : 4/7

u = -20/4/7

u = -35

u = -35

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