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/1.1 = 0.9 // - 0.9
z/1.1-0.9 = 0
0.90909091*z-0.9 = 0 // + 0.9
0.90909091*z = 0.9 // : 0.90909091
z = 0.9/0.90909091
z = 0.99
z = 0.99
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