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10+d=-2-2d
We move all terms to the left:
10+d-(-2-2d)=0
We add all the numbers together, and all the variables
d-(-2d-2)+10=0
We get rid of parentheses
d+2d+2+10=0
We add all the numbers together, and all the variables
3d+12=0
We move all terms containing d to the left, all other terms to the right
3d=-12
d=-12/3
d=-4
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