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b in (-oo:+oo)
b/6 = -12/18 // + -12/18
b/6-(-12/18) = 0
b/6+2/3 = 0
1/6*b+2/3 = 0 // - 2/3
1/6*b = -2/3 // : 1/6
b = -2/3/1/6
b = -4
b = -4
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