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b in (-oo:+oo)
2-3*b = 2*b-38 // - 2*b-38
2-3*b-(2*b)+38 = 0
2-3*b-2*b+38 = 0
40-5*b = 0 // - 40
-5*b = -40 // : -5
b = -40/(-5)
b = 8
b = 8
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