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n in (-oo:+oo)
3*n+21/3 = (4/3)*n+18 // - (4/3)*n+18
3*n-((4/3)*n)+21/3-18 = 0
3*n+(-4/3)*n+21/3-18 = 0
5/3*n-11 = 0 // + 11
5/3*n = 11 // : 5/3
n = 11/5/3
n = 33/5
n = 33/5
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