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x in (-oo:+oo)
(0.046*281)/(65.7+281) = x // - x
(0.046*281)/(65.7+281)-x = 0
0.03728295-x = 0 // - 0.03728295
-x = -0.03728295 // * -1
x = 0.03728295
x = 0.03728295
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