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b in (-oo:+oo)
1-2*b = 2*b-3 // - 2*b-3
1-2*b-(2*b)+3 = 0
1-2*b-2*b+3 = 0
4-4*b = 0 // - 4
-4*b = -4 // : -4
b = -4/(-4)
b = 1
b = 1
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