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x in (-oo:+oo)
p = (7/4)*t+9 // - (7/4)*t+9
p-((7/4)*t)-9 = 0
p+(-7/4)*t-9 = 0
p-7/4*t-9 = 0
x naleu017Cy do R
x in (-oo:+oo)
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