u/9+7=13 - solution

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Solution for u/9+7=13 equation:

u in (-oo:+oo)

u/9+7 = 13 // - 13

u/9-13+7 = 0

1/9*u-6 = 0 // + 6

1/9*u = 6 // : 1/9

u = 6/1/9

u = 54

u = 54

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