9+u/7=12

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Solution for 9+u/7=12 equation: 


u in (-oo:+oo)

u/7+9 = 12 // - 12

u/7-12+9 = 0

1/7*u-3 = 0 // + 3

1/7*u = 3 // : 1/7

u = 3/1/7

u = 21

u = 21

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