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n in (-oo:+oo)
3*n+(1/2)/3 = (4/5)*n+15 // - (4/5)*n+15
3*n-((4/5)*n)+(1/2)/3-15 = 0
3*n+(-4/5)*n+(1/2)/3-15 = 0
11/5*n-89/6 = 0 // + 89/6
11/5*n = 89/6 // : 11/5
n = 89/6/11/5
n = 445/66
n = 445/66
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