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x in (-oo:+oo)
C-(1000/80) = x // - x
C-x-(1000/80) = 0
C-x-25/2 = 0
C-x-25/2 = 0 // - C-25/2
-x = -(C-25/2) // * -1
x = C-25/2
x = C-25/2
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