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x in (-oo:+oo)
14-(y/8) = 3*w-21-4 // - 3*w-21-4
4-(3*w)-(y/8)+14+21 = 0
4-3*w-(y/8)+14+21 = 0
39-3*w-1/8*y = 0
x naleu017Cy do R
x in (-oo:+oo)
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