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x in (-oo:+oo)
2/w = x/5 // - x/5
2/w-(x/5) = 0
2*w^-1-1/5*x = 0 // - 2*w^-1
-1/5*x = -(2*w^-1) // : -1/5
x = (-(2*w^-1))/(-1/5)
x = 10*w^-1
x = 10*w^-1
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