X1 = # of atrium arches [in piece]
x2 = # of window frames [in piece]
x3 = # of doors [in piece]
How do I form this constraint?
There must be no more than 3 times as many window frames as atrium arches.
There also needs to be between two and three window frames per door.
This solution uses linear programming to determine the first constraint, second constraint and non-negativity constraints.