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n in (-oo:+oo)
4-((3/4)*n) = (1/3)*n+3/4 // - (1/3)*n+3/4
4-((3/4)*n)-((1/3)*n)-(3/4) = 0
(-3/4)*n+(-1/3)*n-3/4+4 = 0
13/4-13/12*n = 0 // - 13/4
-13/12*n = -13/4 // : -13/12
n = -13/4/(-13/12)
n = 3
n = 3
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