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y+(y+4)+42=180
We move all terms to the left:
y+(y+4)+42-(180)=0
We add all the numbers together, and all the variables
y+(y+4)-138=0
We get rid of parentheses
y+y+4-138=0
We add all the numbers together, and all the variables
2y-134=0
We move all terms containing y to the left, all other terms to the right
2y=134
y=134/2
y=67
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