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