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x in (-oo:+oo)
(1/2)*x-200 = r // - r
(1/2)*x-r-200 = 0
1/2*x-r-200 = 0 // + -r-200
1/2*x = -(-r-200) // : 1/2
x = (-(-r-200))/1/2
x = 2*(r+200)
x = 2*(r+200)
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