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x in (-oo:+oo)
c = (1.4*w)/2+14 // - (1.4*w)/2+14
c-((1.4*w)/2)-14 = 0
c-0.7*w-14 = 0
c-0.7*w-14 = 0
x naleu017Cy do R
x in (-oo:+oo)
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