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x in (-oo:+oo)
1.28 = x-(50/12) // - x-(50/12)
50/12-x+1.28 = 0
5.44666667-x = 0 // - 5.44666667
-x = -5.44666667 // * -1
x = 5.44666667
x = 5.44666667
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