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d+d=54-2
We move all terms to the left:
d+d-(54-2)=0
We add all the numbers together, and all the variables
d+d-52=0
We add all the numbers together, and all the variables
2d-52=0
We move all terms containing d to the left, all other terms to the right
2d=52
d=52/2
d=26
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