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n in (-oo:+oo)
2*n-((2/3)*(4*n+12)) = n+7 // - n+7
2*n-((2/3)*(4*n+12))-n-7 = 0
(-2/3)*(4*n+12)+2*n-n-7 = 0
2*n-2/3*(4*n+12)-n-7 = 0
2*n-2/3*(4*n+12)-n-7 = 0
-2/3*n-n-8-7 = 0
-5/3*n-8-7 = 0
-5/3*n-15 = 0
-5/3*n-15 = 0
-5/3*n-15 = 0 // + 15
-5/3*n = 15 // : -5/3
n = 15/(-5/3)
n = -9
n = -9
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