-3u/4=-21

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Solution for -3u/4=-21 equation: 


u in (-oo:+oo)

(-3*u)/4 = -21 // + 21

(-3*u)/4+21 = 0

21-3/4*u = 0 // - 21

-3/4*u = -21 // : -3/4

u = -21/(-3/4)

u = 28

u = 28

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