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x in (-oo:+oo)
Z = (1/2)*z+4 // - (1/2)*z+4
Z-((1/2)*z)-4 = 0
Z+(-1/2)*z-4 = 0
Z-1/2*z-4 = 0
x naleu017Cy do R
x in (-oo:+oo)
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