Question 779489
Let c = count of runs through the planer.  Thickness removed for c runs is 0.015c.

Thickness of board if starting 0.875 inches thick is 0.875-0.015c.  Wanting the resulting thickness of the board to be 0.74, then makes the statement:

{{{0.875-0.015c=0.74}}} and you would make a sensible judgement in case c is not a whole number.