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)
f/12.7 = 1.7 // - 1.7
f/12.7-1.7 = 0
0.07874016*f-1.7 = 0 // + 1.7
0.07874016*f = 1.7 // : 0.07874016
f = 1.7/0.07874016
f = 21.58999931
f = 21.58999931
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