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x in (-oo:+oo)
X/2+5 = x // - x
X/2-x+5 = 0
1/2*X-x+5 = 0 // - 1/2*X+5
-x = -(1/2*X+5) // * -1
x = 1/2*X+5
x = 1/2*X+5
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