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n in (-oo:+oo)
-15 = (-3/5)*n // - (-3/5)*n
-((-3/5)*n)-15 = 0
(3/5)*n-15 = 0
3/5*n-15 = 0 // + 15
3/5*n = 15 // : 3/5
n = 15/3/5
n = 25
n = 25
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