21=u/3+6

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Solution for 21=u/3+6 equation: 


u in (-oo:+oo)

21 = u/3+6 // - u/3+6

21-(u/3)-6 = 0

15-1/3*u = 0 // - 15

-1/3*u = -15 // : -1/3

u = -15/(-1/3)

u = 45

u = 45

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