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x in (-oo:+oo)
x-((4*x)/2) = x+25 // - x+25
x-((4*x)/2)-x-25 = 0
x-2*x-x-25 = 0
-2*x-25 = 0 // + 25
-2*x = 25 // : -2
x = 25/(-2)
x = -25/2
x = -25/2
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