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9=1-2d
We move all terms to the left:
9-(1-2d)=0
We add all the numbers together, and all the variables
-(-2d+1)+9=0
We get rid of parentheses
2d-1+9=0
We add all the numbers together, and all the variables
2d+8=0
We move all terms containing d to the left, all other terms to the right
2d=-8
d=-8/2
d=-4
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