9=-3/7u

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Solution for 9=-3/7u equation: 


u in (-oo:+oo)

9 = (-3/7)*u // - (-3/7)*u

9-((-3/7)*u) = 0

(3/7)*u+9 = 0

3/7*u+9 = 0 // - 9

3/7*u = -9 // : 3/7

u = -9/3/7

u = -21

u = -21

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