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(51)+(y+9)=180
We move all terms to the left:
(51)+(y+9)-(180)=0
We add all the numbers together, and all the variables
(y+9)-129=0
We get rid of parentheses
y+9-129=0
We add all the numbers together, and all the variables
y-120=0
We move all terms containing y to the left, all other terms to the right
y=120
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