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n in (-oo:+oo)
6-(4*n) = 10 // - 10
6-(4*n)-10 = 0
6-4*n-10 = 0
-4*n-4 = 0 // + 4
-4*n = 4 // : -4
n = 4/(-4)
n = -1
n = -1
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