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b in (-oo:+oo)
(1/2)*b-((1/2)*b)+3/4 = 3/4 // - 3/4
(1/2)*b-((1/2)*b)+3/4-(3/4) = 0
(1/2)*b+(-1/2)*b+3/4-3/4 = 0
0 = 0
b naleu017Cy do R
b in (-oo:+oo)
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