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x in (-oo:+oo)
225-(x/2) = y // - y
225-(x/2)-y = 0
225-1/2*x-y = 0 // - 225-y
-1/2*x = -(225-y) // : -1/2
x = (-(225-y))/(-1/2)
x = -2*(y-225)
x = -2*(y-225)
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