If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/4.2 = -20.45 // + 20.45
x/4.2+20.45 = 0
0.23809524*x+20.45 = 0 // - 20.45
0.23809524*x = -20.45 // : 0.23809524
x = -20.45/0.23809524
x = -85.88999931
x = -85.88999931
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