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