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d-107=-d-7
We move all terms to the left:
d-107-(-d-7)=0
We add all the numbers together, and all the variables
d-(-1d-7)-107=0
We get rid of parentheses
d+1d+7-107=0
We add all the numbers together, and all the variables
2d-100=0
We move all terms containing d to the left, all other terms to the right
2d=100
d=100/2
d=50
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