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-4y+9=-9-7y
We move all terms to the left:
-4y+9-(-9-7y)=0
We add all the numbers together, and all the variables
-4y-(-7y-9)+9=0
We get rid of parentheses
-4y+7y+9+9=0
We add all the numbers together, and all the variables
3y+18=0
We move all terms containing y to the left, all other terms to the right
3y=-18
y=-18/3
y=-6
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