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42=-2d+6.d
We move all terms to the left:
42-(-2d+6.d)=0
We add all the numbers together, and all the variables
-(+4d)+42=0
We get rid of parentheses
-4d+42=0
We move all terms containing d to the left, all other terms to the right
-4d=-42
d=-42/-4
d=10+1/2
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