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5d-2d=2d-18-2d
We move all terms to the left:
5d-2d-(2d-18-2d)=0
We add all the numbers together, and all the variables
5d-2d-(-18)=0
We add all the numbers together, and all the variables
3d+18=0
We move all terms containing d to the left, all other terms to the right
3d=-18
d=-18/3
d=-6
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