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x in (-oo:+oo)
7*c-c-(c*((2*d)/8))-(c*((3*d)/3))-2 = 0
7*c-c+(-1/4)*c*d-(c*d)-2 = 0
6*c-5/4*c*d-2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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