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x in (-oo:+oo)
B-(1/2) = b/3+7 // - b/3+7
B-(b/3)-(1/2)-7 = 0
B-(b/3)-1/2-7 = 0
B-1/3*b-15/2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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