-3+u/3=-9 - solution

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Solution for -3+u/3=-9 equation:

u in (-oo:+oo)

u/3-3 = -9 // + 9

u/3-3+9 = 0

1/3*u+6 = 0 // - 6

1/3*u = -6 // : 1/3

u = -6/1/3

u = -18

u = -18

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