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b in (-oo:+oo)
4*b+6 = (2*b)/3 // - (2*b)/3
4*b-((2*b)/3)+6 = 0
4*b+(-2/3)*b+6 = 0
10/3*b+6 = 0 // - 6
10/3*b = -6 // : 10/3
b = -6/10/3
b = -9/5
b = -9/5
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