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 = 20.78 // - 20.78
d/9.7-20.78 = 0
0.10309278*d-20.78 = 0 // + 20.78
0.10309278*d = 20.78 // : 0.10309278
d = 20.78/0.10309278
d = 201.56600685
d = 201.56600685
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