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7+2y=-9+4y
We move all terms to the left:
7+2y-(-9+4y)=0
We add all the numbers together, and all the variables
2y-(4y-9)+7=0
We get rid of parentheses
2y-4y+9+7=0
We add all the numbers together, and all the variables
-2y+16=0
We move all terms containing y to the left, all other terms to the right
-2y=-16
y=-16/-2
y=+8
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