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b in (-oo:+oo)
15 = b+4/1.2 // - b+4/1.2
15-b-(4/1.2) = 0
15-b-3.33333333 = 0
11.66666667-b = 0 // - 11.66666667
-b = -11.66666667 // * -1
b = 11.66666667
b = 11.66666667
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