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-(2.1/8) = 5.7/8 // - 5.7/8
z-(2.1/8)-(5.7/8) = 0
z-0.7125-0.2625 = 0
z-0.975 = 0 // + 0.975
z = 0.975
z = 0.975
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