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)
-1/2 = x-1 // - x-1
1-x-1/2 = 0
1/2-x = 0 // - 1/2
-x = -1/2 // * -1
x = 1/2
x = 1/2
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