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n in (-oo:+oo)
-7 = -((4/5)*n)-5 // + -((4/5)*n)-5
(4/5)*n-7+5 = 0
4/5*n-2 = 0 // + 2
4/5*n = 2 // : 4/5
n = 2/4/5
n = 5/2
n = 5/2
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