If it's not what You are looking for type in the equation solver your own equation and let us solve it.
z in (-oo:+oo)
z-(z/0.5)+0.75 = 0.25 // - 0.25
z-(z/0.5)-0.25+0.75 = 0
z-2*z-0.25+0.75 = 0
0.5-z = 0 // - 0.5
-z = -0.5 // * -1
z = 0.5
z = 0.5
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