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y-9=4+2y
We move all terms to the left:
y-9-(4+2y)=0
We add all the numbers together, and all the variables
y-(2y+4)-9=0
We get rid of parentheses
y-2y-4-9=0
We add all the numbers together, and all the variables
-1y-13=0
We move all terms containing y to the left, all other terms to the right
-y=13
y=13/-1
y=-13
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