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b in (-oo:+oo)
4*b-4 = -26/5 // + -26/5
4*b-(-26/5)-4 = 0
4*b+26/5-4 = 0
4*b+6/5 = 0 // - 6/5
4*b = -6/5 // : 4
b = -6/5/4
b = -3/10
b = -3/10
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