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x in (-oo:+oo)
t = (9/2)*m+21 // - (9/2)*m+21
t-((9/2)*m)-21 = 0
(-9/2)*m+t-21 = 0
t-9/2*m-21 = 0
x naleu017Cy do R
x in (-oo:+oo)
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