Question 1064653
The center of the window should sit on the center of the room.
{{{C[w]=75/2=37&1/2}}}
{{{C[r]=(17*12+5)/2=209/2=104&1/2}}}
So at the center of the room, place a ruler and place a mark {{{37&1/2}}}inches to the left at X where, 
{{{X=104&1/2-37&1/2=67}}}{{{in}}}
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{{{X}}} is the position of the left side of the window.