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n in (-oo:+oo)
-9 = (-3/4)*n // - (-3/4)*n
-((-3/4)*n)-9 = 0
(3/4)*n-9 = 0
3/4*n-9 = 0 // + 9
3/4*n = 9 // : 3/4
n = 9/3/4
n = 12
n = 12
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