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b in (-oo:+oo)
(1/2)*b+(1/4)*b = 6 // - 6
(1/2)*b+(1/4)*b-6 = 0
3/4*b-6 = 0 // + 6
3/4*b = 6 // : 3/4
b = 6/3/4
b = 8
b = 8
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