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b in (-oo:+oo)
-b/1.2 = 7 // - 7
-b/1.2-7 = 0
-0.83333333*b-7 = 0 // + 7
-0.83333333*b = 7 // : -0.83333333
b = 7/(-0.83333333)
b = -8.40000003
b = -8.40000003
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