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/45-0.1 = 0.1 // - 0.1
z/45-0.1-0.1 = 0
1/45*z-0.2 = 0 // + 0.2
1/45*z = 0.2 // : 1/45
z = 0.2/1/45
z = 9.0000009
z = 9.0000009
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