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2d+5d=200+3d
We move all terms to the left:
2d+5d-(200+3d)=0
We add all the numbers together, and all the variables
2d+5d-(3d+200)=0
We add all the numbers together, and all the variables
7d-(3d+200)=0
We get rid of parentheses
7d-3d-200=0
We add all the numbers together, and all the variables
4d-200=0
We move all terms containing d to the left, all other terms to the right
4d=200
d=200/4
d=50
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