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b in (-oo:+oo)
-3*b-3 = -2*b-7 // + -2*b-7
7-3*b-(-2*b)-3 = 0
2*b-3*b-3+7 = 0
4-b = 0 // - 4
-b = -4 // * -1
b = 4
b = 4
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