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2(-9-2y)-y=-13
We move all terms to the left:
2(-9-2y)-y-(-13)=0
We add all the numbers together, and all the variables
2(-2y-9)-y-(-13)=0
We add all the numbers together, and all the variables
-1y+2(-2y-9)+13=0
We multiply parentheses
-1y-4y-18+13=0
We add all the numbers together, and all the variables
-5y-5=0
We move all terms containing y to the left, all other terms to the right
-5y=5
y=5/-5
y=-1
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