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4d+9=-1+3d
We move all terms to the left:
4d+9-(-1+3d)=0
We add all the numbers together, and all the variables
4d-(3d-1)+9=0
We get rid of parentheses
4d-3d+1+9=0
We add all the numbers together, and all the variables
d+10=0
We move all terms containing d to the left, all other terms to the right
d=-10
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