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b in (-oo:+oo)
b+(3/2)*b+b+2*b-90+45+90 = 560 // - 560
b+(3/2)*b+b+2*b-560-90+45+90 = 0
11/2*b-515 = 0 // + 515
11/2*b = 515 // : 11/2
b = 515/11/2
b = 1030/11
b = 1030/11
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