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b in (-oo:+oo)
2*b-7 = 65-4*b // - 65-4*b
2*b-(-4*b)-65-7 = 0
2*b+4*b-65-7 = 0
6*b-72 = 0 // + 72
6*b = 72 // : 6
b = 72/6
b = 12
b = 12
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