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(y-2)-(y+7)=4y
We move all terms to the left:
(y-2)-(y+7)-(4y)=0
We add all the numbers together, and all the variables
-4y+(y-2)-(y+7)=0
We get rid of parentheses
-4y+y-y-2-7=0
We add all the numbers together, and all the variables
-4y-9=0
We move all terms containing y to the left, all other terms to the right
-4y=9
y=9/-4
y=-2+1/4
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