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