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x in (-oo:+oo)
1.28 = x-(40/3) // - x-(40/3)
40/3-x+1.28 = 0
14.61333333-x = 0 // - 14.61333333
-x = -14.61333333 // * -1
x = 14.61333333
x = 14.61333333
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