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b in (-oo:+oo)
3/4-(1/2) = -3*b // + -3*b
3/4-(-3*b)-(1/2) = 0
3*b+3/4-1/2 = 0
3*b+1/4 = 0 // - 1/4
3*b = -1/4 // : 3
b = -1/4/3
b = -1/12
b = -1/12
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