3/10=-2/7u

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Solution for 3/10=-2/7u equation: 


u in (-oo:+oo)

3/10 = (-2/7)*u // - (-2/7)*u

3/10-((-2/7)*u) = 0

(2/7)*u+3/10 = 0

2/7*u+3/10 = 0 // - 3/10

2/7*u = -3/10 // : 2/7

u = -3/10/2/7

u = -21/20

u = -21/20

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