3/7u=-9

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Solution for 3/7u=-9 equation: 


u in (-oo:+oo)

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

(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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