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/6-2.67 = 0.67 // - 0.67
d/6-2.67-0.67 = 0
1/6*d-3.34 = 0 // + 3.34
1/6*d = 3.34 // : 1/6
d = 3.34/1/6
d = 20.0399996
d = 20.0399996
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