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9+2d=-2+d
We move all terms to the left:
9+2d-(-2+d)=0
We add all the numbers together, and all the variables
2d-(d-2)+9=0
We get rid of parentheses
2d-d+2+9=0
We add all the numbers together, and all the variables
d+11=0
We move all terms containing d to the left, all other terms to the right
d=-11
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