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b in (-oo:+oo)
2*b+1/4 = 5*b+13 // - 5*b+13
2*b-(5*b)+1/4-13 = 0
2*b-5*b+1/4-13 = 0
-3*b-51/4 = 0 // + 51/4
-3*b = 51/4 // : -3
b = 51/4/(-3)
b = -17/4
b = -17/4
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