21=-7/6*u

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Solution for 21=-7/6*u equation: 


u in (-oo:+oo)

21 = (-7/6)*u // - (-7/6)*u

21-((-7/6)*u) = 0

(7/6)*u+21 = 0

7/6*u+21 = 0 // - 21

7/6*u = -21 // : 7/6

u = -21/7/6

u = -18

u = -18

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