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d/9+21=25
We move all terms to the left:
d/9+21-(25)=0
We add all the numbers together, and all the variables
d/9-4=0
We multiply all the terms by the denominator
d-4*9=0
We add all the numbers together, and all the variables
d-36=0
We move all terms containing d to the left, all other terms to the right
d=36
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