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b in (-oo:+oo)
3*b+8 = 101/10-4*b // - 101/10-4*b
3*b-(-4*b)-(101/10)+8 = 0
3*b+4*b-101/10+8 = 0
7*b-21/10 = 0 // + 21/10
7*b = 21/10 // : 7
b = 21/10/7
b = 3/10
b = 3/10
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