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20y-11+4y+7+7y-7=180
We move all terms to the left:
20y-11+4y+7+7y-7-(180)=0
We add all the numbers together, and all the variables
31y-191=0
We move all terms containing y to the left, all other terms to the right
31y=191
y=191/31
y=6+5/31
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