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8-5y=4-7y
We move all terms to the left:
8-5y-(4-7y)=0
We add all the numbers together, and all the variables
-5y-(-7y+4)+8=0
We get rid of parentheses
-5y+7y-4+8=0
We add all the numbers together, and all the variables
2y+4=0
We move all terms containing y to the left, all other terms to the right
2y=-4
y=-4/2
y=-2
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