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b in (-oo:+oo)
b+4 = 60-6*b // - 60-6*b
b-(-6*b)-60+4 = 0
b+6*b-60+4 = 0
7*b-56 = 0 // + 56
7*b = 56 // : 7
b = 56/7
b = 8
b = 8
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