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b in (-oo:+oo)
-51 = -2*b-(4*b)-3 // + -2*b-(4*b)-3
4*b-(-2*b)-51+3 = 0
2*b+4*b-51+3 = 0
6*b-48 = 0 // + 48
6*b = 48 // : 6
b = 48/6
b = 8
b = 8
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