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n in (-oo:+oo)
3*n+7 = (4/5)*n+12 // - (4/5)*n+12
3*n-((4/5)*n)-12+7 = 0
3*n+(-4/5)*n-12+7 = 0
11/5*n-5 = 0 // + 5
11/5*n = 5 // : 11/5
n = 5/11/5
n = 25/11
n = 25/11
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