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b in (-oo:+oo)
4*b+6 = 46-6*b // - 46-6*b
4*b-(-6*b)-46+6 = 0
4*b+6*b-46+6 = 0
10*b-40 = 0 // + 40
10*b = 40 // : 10
b = 40/10
b = 4
b = 4
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