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d+8=-d-10
We move all terms to the left:
d+8-(-d-10)=0
We add all the numbers together, and all the variables
d-(-1d-10)+8=0
We get rid of parentheses
d+1d+10+8=0
We add all the numbers together, and all the variables
2d+18=0
We move all terms containing d to the left, all other terms to the right
2d=-18
d=-18/2
d=-9
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