u/4-12=-9 - solution

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Solution for u/4-12=-9 equation:

u in (-oo:+oo)

u/4-12 = -9 // + 9

u/4-12+9 = 0

1/4*u-3 = 0 // + 3

1/4*u = 3 // : 1/4

u = 3/1/4

u = 12

u = 12

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