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n in (-oo:+oo)
6-(3*n) = 4*n+90 // - 4*n+90
6-(3*n)-(4*n)-90 = 0
6-3*n-4*n-90 = 0
-7*n-84 = 0 // + 84
-7*n = 84 // : -7
n = 84/(-7)
n = -12
n = -12
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