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x in (-oo:+oo)
X-50 = x/2-100 // - x/2-100
X-(x/2)-50+100 = 0
X-1/2*x+50 = 0 // - X+50
-1/2*x = -(X+50) // : -1/2
x = (-(X+50))/(-1/2)
x = 2*(X+50)
x = 2*(X+50)
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