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n in (-oo:+oo)
6*(-(4*n)-7) = 222 // - 222
6*(-(4*n)-7)-222 = 0
6*(-4*n-7)-222 = 0
6*(-4*n-7)-222 = 0
-24*n-264 = 0
-24*n-264 = 0
-24*n-264 = 0 // + 264
-24*n = 264 // : -24
n = 264/(-24)
n = -11
n = -11
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