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x in (-oo:+oo)
3*n+12/3 = (4/5)*m+15 // - (4/5)*m+15
3*n-((4/5)*m)+12/3-15 = 0
(-4/5)*m+3*n+12/3-15 = 0
3*n-4/5*m-11 = 0
x naleu017Cy do R
x in (-oo:+oo)
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