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n in (-oo:+oo)
3*n+8 = (4/5)*n+15 // - (4/5)*n+15
3*n-((4/5)*n)-15+8 = 0
3*n+(-4/5)*n-15+8 = 0
11/5*n-7 = 0 // + 7
11/5*n = 7 // : 11/5
n = 7/11/5
n = 35/11
n = 35/11
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