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b in (-oo:+oo)
2*b+b+(1/2)*b+50+100 = 1500 // - 1500
2*b+b+(1/2)*b-1500+50+100 = 0
7/2*b-1350 = 0 // + 1350
7/2*b = 1350 // : 7/2
b = 1350/7/2
b = 2700/7
b = 2700/7
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