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x in (-oo:+oo)
v = (-3/4)*r+6 // - (-3/4)*r+6
v-((-3/4)*r)-6 = 0
(3/4)*r+v-6 = 0
3/4*r+v-6 = 0
x naleu017Cy do R
x in (-oo:+oo)
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