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b in (-oo:+oo)
-3 = 15-((1/2)*b) // - 15-((1/2)*b)
(1/2)*b-15-3 = 0
1/2*b-18 = 0 // + 18
1/2*b = 18 // : 1/2
b = 18/1/2
b = 36
b = 36
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