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x in (-oo:+oo)
5/2-x = (-2*x)/10 // - (-2*x)/10
5/2-x-((-2*x)/10) = 0
(1/5)*x-x+5/2 = 0
5/2-4/5*x = 0 // - 5/2
-4/5*x = -5/2 // : -4/5
x = -5/2/(-4/5)
x = 25/8
x = 25/8
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