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x in (-oo:+oo)
f = (9/5)*c+3 // - (9/5)*c+3
f-((9/5)*c)-3 = 0
(-9/5)*c+f-3 = 0
f-9/5*c-3 = 0
x naleu017Cy do R
x in (-oo:+oo)
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