If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y-(1/2) = -x-(1/2) // + -x-(1/2)
x+y-(1/2)+1/2 = 0
x+y-1/2+1/2 = 0
x+y = 0 // - y
x = -y
x = -y
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