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-7d=-10d+12
We move all terms to the left:
-7d-(-10d+12)=0
We get rid of parentheses
-7d+10d-12=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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