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b in (-oo:+oo)
5*b+2 = 34/7 // - 34/7
5*b-(34/7)+2 = 0
5*b-34/7+2 = 0
5*b-20/7 = 0 // + 20/7
5*b = 20/7 // : 5
b = 20/7/5
b = 4/7
b = 4/7
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