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x in (-oo:+oo)
4*x-(5/5) = 2*z // - 2*z
4*x-(2*z)-(5/5) = 0
4*x-2*z-1 = 0
4*x-2*z-1 = 0 // + -2*z-1
4*x = -(-2*z-1) // : 4
x = (-(-2*z-1))/4
x = (1-(-2*z))/4
x = (1-(-2*z))/4
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