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n in (-oo:+oo)
-((1/5)*n)-25 = (3/5)*n // - (3/5)*n
-((1/5)*n)-((3/5)*n)-25 = 0
(-1/5)*n+(-3/5)*n-25 = 0
-4/5*n-25 = 0 // + 25
-4/5*n = 25 // : -4/5
n = 25/(-4/5)
n = -125/4
n = -125/4
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