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3y+9-y=1+y+3
We move all terms to the left:
3y+9-y-(1+y+3)=0
We add all the numbers together, and all the variables
3y-y-(y+4)+9=0
We add all the numbers together, and all the variables
2y-(y+4)+9=0
We get rid of parentheses
2y-y-4+9=0
We add all the numbers together, and all the variables
y+5=0
We move all terms containing y to the left, all other terms to the right
y=-5
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