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b in (-oo:+oo)
2*b+5 = (3/7)*b+32/7 // - (3/7)*b+32/7
2*b-((3/7)*b)-(32/7)+5 = 0
2*b+(-3/7)*b-32/7+5 = 0
11/7*b+3/7 = 0 // - 3/7
11/7*b = -3/7 // : 11/7
b = -3/7/11/7
b = -3/11
b = -3/11
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