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n in (-oo:+oo)
8*n-((3/4)*(12*n+28)) = 0
(-3/4)*(12*n+28)+8*n = 0
8*n-3/4*(12*n+28) = 0
8*n-3/4*(12*n+28) = 0
-n-21 = 0
-n-21 = 0
-n-21 = 0 // + 21
-n = 21 // * -1
n = -21
n = -21
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