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64=100-9d
We move all terms to the left:
64-(100-9d)=0
We add all the numbers together, and all the variables
-(-9d+100)+64=0
We get rid of parentheses
9d-100+64=0
We add all the numbers together, and all the variables
9d-36=0
We move all terms containing d to the left, all other terms to the right
9d=36
d=36/9
d=4
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