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5y+12y+9=4y+42
We move all terms to the left:
5y+12y+9-(4y+42)=0
We add all the numbers together, and all the variables
17y-(4y+42)+9=0
We get rid of parentheses
17y-4y-42+9=0
We add all the numbers together, and all the variables
13y-33=0
We move all terms containing y to the left, all other terms to the right
13y=33
y=33/13
y=2+7/13
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