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b in (-oo:+oo)
2*b-5 = -27/7 // + -27/7
2*b-(-27/7)-5 = 0
2*b+27/7-5 = 0
2*b-8/7 = 0 // + 8/7
2*b = 8/7 // : 2
b = 8/7/2
b = 4/7
b = 4/7
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