-21=u/3-3

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


u in (-oo:+oo)

-21 = u/3-3 // - u/3-3

3-(u/3)-21 = 0

-1/3*u-18 = 0 // + 18

-1/3*u = 18 // : -1/3

u = 18/(-1/3)

u = -54

u = -54

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