If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
f = 2/4 // - 2/4
f-(2/4) = 0
f-1/2 = 0
f-1/2 = 0 // + 1/2
f = 1/2
f = 1/2
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