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b in (-oo:+oo)
b/2 = -6/7 // + -6/7
b/2-(-6/7) = 0
b/2+6/7 = 0
1/2*b+6/7 = 0 // - 6/7
1/2*b = -6/7 // : 1/2
b = -6/7/1/2
b = -12/7
b = -12/7
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