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x in (-oo:+oo)
(x-c)/2 = d // - d
(x-c)/2-d = 0
(x-c)/2+(2*(-d))/2 = 0
2*(-d)-c+x = 0
x-c-2*d = 0
(x-c-2*d)/2 = 0
(x-c-2*d)/2 = 0 // * 2
x-c-2*d = 0
x-c-2*d = 0 // + -c-2*d
x = -(-c-2*d)
x = c-(-2*d)
x = c-(-2*d)
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