debug info

bad
	<a:xfrm>
		<a:off x="56903" y="0"/>
		<a:ext cx="12488604" cy="9753600"/>
	</a:xfrm>

good
	<a:xfrm>
		<a:off x="177800" y="0"/>
		<a:ext cx="8781050" cy="6858000"/>
	</a:xfrm>

want:
x,y,cx,cy
(20.322663252240716, 0, 983.3546734955186, 768)

20.322663252240716 --> 177800

0 --> 0

983.3546734955186 --> 8781050 = 104.5 wDPI

768 --> 6858000 == 102.4 vDPI

983.3546734955186/8781050*914400 = 102.4 wDPI

983.3546734955186/8781050*914400

1024/9144000*val = horPix
pixels

9144000/1024

20.322663252240716*914400/... = 104.5