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-30+12d=10+2d
We move all terms to the left:
-30+12d-(10+2d)=0
We add all the numbers together, and all the variables
12d-(2d+10)-30=0
We get rid of parentheses
12d-2d-10-30=0
We add all the numbers together, and all the variables
10d-40=0
We move all terms containing d to the left, all other terms to the right
10d=40
d=40/10
d=4
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