r(d) = d+90.43 / 6.97
r(d(r)) = 6.97r -90.43+90.43 / 6.97 = 6.97r/6.97 = r check
d(r(d)) = 6.97(d+90.43 / 6.97) - 90.43 = d+90.43-90.43 = d check
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