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