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b in (-oo:+oo)
3*b-4 = -29/5 // + -29/5
3*b-(-29/5)-4 = 0
3*b+29/5-4 = 0
3*b+9/5 = 0 // - 9/5
3*b = -9/5 // : 3
b = -9/5/3
b = -3/5
b = -3/5
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