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x in (-oo:+oo)
(1/2)*(-2/9)+(2/5)*(-2/9-2) = x // - x
(1/2)*(-2/9)-x+(2/5)*(-2/9-2) = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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