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x in (-oo:+oo)
X/2 = x+10 // - x+10
X/2-x-10 = 0
1/2*X-x-10 = 0 // - 1/2*X-10
-x = -(1/2*X-10) // * -1
x = 1/2*X-10
x = 1/2*X-10
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