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d-3=-d-10
We move all terms to the left:
d-3-(-d-10)=0
We add all the numbers together, and all the variables
d-(-1d-10)-3=0
We get rid of parentheses
d+1d+10-3=0
We add all the numbers together, and all the variables
2d+7=0
We move all terms containing d to the left, all other terms to the right
2d=-7
d=-7/2
d=-3+1/2
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