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b in (-oo:+oo)
b+(3/2)*b+b+2*b-90+45+90 = 540 // - 540
b+(3/2)*b+b+2*b-540-90+45+90 = 0
11/2*b-495 = 0 // + 495
11/2*b = 495 // : 11/2
b = 495/11/2
b = 90
b = 90
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