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/4.2 = 8.5 // - 8.5
z/4.2-8.5 = 0
0.23809524*z-8.5 = 0 // + 8.5
0.23809524*z = 8.5 // : 0.23809524
z = 8.5/0.23809524
z = 35.69999971
z = 35.69999971
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