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x in (-oo:+oo)
2 = (x-u)/o // - (x-u)/o
2-((x-u)/o) = 0
(-1*(x-u))/o+2 = 0
(-1*(x-u))/o+(2*o)/o = 0
2*o-1*(x-u) = 0
2*o+u-x = 0
(2*o+u-x)/o = 0
(2*o+u-x)/o = 0 // * o
2*o+u-x = 0
2*o+u-x = 0 // - 2*o+u
-x = -(2*o+u) // * -1
x = 2*o+u
x = 2*o+u
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