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x in (-oo:+oo)
x-(d/c) = 2*a // - 2*a
x-(2*a)-(d/c) = 0
x-2*a-(d/c) = 0
x-2*a-(c^-1*d) = 0 // + -2*a-(c^-1*d)
x = -(-2*a-(c^-1*d))
x = c^-1*d-(-2*a)
x = c^-1*d-(-2*a)
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