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x in (-oo:+oo)
F = (6/5)*n-78 // - (6/5)*n-78
F-((6/5)*n)+78 = 0
F+(-6/5)*n+78 = 0
F-6/5*n+78 = 0
x naleu017Cy do R
x in (-oo:+oo)
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