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x in (-oo:+oo)
U = (1/2)*x-3 // - (1/2)*x-3
U-((1/2)*x)+3 = 0
U+(-1/2)*x+3 = 0
U-1/2*x+3 = 0 // - U+3
-1/2*x = -(U+3) // : -1/2
x = (-(U+3))/(-1/2)
x = 2*(U+3)
x = 2*(U+3)
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