u/3-9=12 - solution

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Solution for u/3-9=12 equation:

u in (-oo:+oo)

u/3-9 = 12 // - 12

u/3-12-9 = 0

1/3*u-21 = 0 // + 21

1/3*u = 21 // : 1/3

u = 21/1/3

u = 63

u = 63

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