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n in (-oo:+oo)
(-1/5)*(n-3) = (1/5)*(n-(3/4)) // - (1/5)*(n-(3/4))
(-1/5)*(n-3)-((1/5)*(n-(3/4))) = 0
(-1/5)*(n-3)+(-1/5)*(n-3/4) = 0
-1/5*(n-3)-1/5*(n-3/4) = 0
-1/5*(n-3)-1/5*(n-3/4) = 0
3/4-2/5*n = 0
3/4-2/5*n = 0
3/4-2/5*n = 0 // - 3/4
-2/5*n = -3/4 // : -2/5
n = -3/4/(-2/5)
n = 15/8
n = 15/8
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