If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
d/9.7 = 0.8 // - 0.8
d/9.7-0.8 = 0
0.10309278*d-0.8 = 0 // + 0.8
0.10309278*d = 0.8 // : 0.10309278
d = 0.8/0.10309278
d = 7.76000026
d = 7.76000026
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