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b in (-oo:+oo)
(1/2)*b+(1/3)*b-20 = -10 // + 10
(1/2)*b+(1/3)*b-20+10 = 0
5/6*b-10 = 0 // + 10
5/6*b = 10 // : 5/6
b = 10/5/6
b = 12
b = 12
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