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d-64=-d-8
We move all terms to the left:
d-64-(-d-8)=0
We add all the numbers together, and all the variables
d-(-1d-8)-64=0
We get rid of parentheses
d+1d+8-64=0
We add all the numbers together, and all the variables
2d-56=0
We move all terms containing d to the left, all other terms to the right
2d=56
d=56/2
d=28
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