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b in (-oo:+oo)
4*b+6 = 60-2*b // - 60-2*b
4*b-(-2*b)-60+6 = 0
4*b+2*b-60+6 = 0
6*b-54 = 0 // + 54
6*b = 54 // : 6
b = 54/6
b = 9
b = 9
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