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n in (-oo:+oo)
-4*n-(3/3) = 7 // - 7
-4*n-(3/3)-7 = 0
-4*n-7-1 = 0
-4*n-8 = 0 // + 8
-4*n = 8 // : -4
n = 8/(-4)
n = -2
n = -2
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