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b in (-oo:+oo)
b+b+2*b+3/2-90+45+90 = 540 // - 540
b+b+2*b+3/2-540-90+45+90 = 0
4*b-987/2 = 0 // + 987/2
4*b = 987/2 // : 4
b = 987/2/4
b = 987/8
b = 987/8
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