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b in (-oo:+oo)
2*b+(2/3)*b+b+b-90+45+90 = 540 // - 540
2*b+(2/3)*b+b+b-540-90+45+90 = 0
14/3*b-495 = 0 // + 495
14/3*b = 495 // : 14/3
b = 495/14/3
b = 1485/14
b = 1485/14
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