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n in (-oo:+oo)
3*n+4/3 = (4/5)*n+15 // - (4/5)*n+15
3*n-((4/5)*n)+4/3-15 = 0
3*n+(-4/5)*n+4/3-15 = 0
11/5*n-41/3 = 0 // + 41/3
11/5*n = 41/3 // : 11/5
n = 41/3/11/5
n = 205/33
n = 205/33
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