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Block diagram simplification

JohnCU

Banned
link to pdf

check out problem 2, step 3. where he has a -G2H1 and a +H1G1G2 in his num/denom, I get a +G2H1 and a -H1G1G2, where am I going wrong?

i've asked everyone in class and no one knows why and the teacher is out of town grrrr.
 
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