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x in (-oo:+oo)
1 = (1*4*x)/2+2*(1/2) // - (1*4*x)/2+2*(1/2)
1-((1*4*x)/2)-(2*(1/2)) = 0
1-2*x-1 = 0
-2*x = 0 // : -2
x = 0
x = 0
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