If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
9/18 = 4.187/8-f // - 4.187/8-f
f+9/18-(4.187/8) = 0
f+9/18-0.523375 = 0
f-0.023375 = 0 // + 0.023375
f = 0.023375
f = 0.023375
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