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b in (-oo:+oo)
7*b-8 = 4*b-26 // - 4*b-26
7*b-(4*b)-8+26 = 0
7*b-4*b-8+26 = 0
3*b+18 = 0 // - 18
3*b = -18 // : 3
b = -18/3
b = -6
b = -6
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