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b in (-oo:+oo)
b+2/4 = (3*b)/6 // - (3*b)/6
b-((3*b)/6)+2/4 = 0
b+(-1/2)*b+2/4 = 0
1/2*b+1/2 = 0 // - 1/2
1/2*b = -1/2 // : 1/2
b = -1/2/1/2
b = -1
b = -1
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