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x in (-oo:+oo)
T = (9/5)*s+18 // - (9/5)*s+18
T-((9/5)*s)-18 = 0
T+(-9/5)*s-18 = 0
T-9/5*s-18 = 0
x naleu017Cy do R
x in (-oo:+oo)
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