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b in (-oo:+oo)
b+(3/2)*b+2*b+b-90+45+90 = 40 // - 40
b+(3/2)*b+2*b+b-90-40+45+90 = 0
11/2*b+5 = 0 // - 5
11/2*b = -5 // : 11/2
b = -5/11/2
b = -10/11
b = -10/11
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