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-2(4-d)=10
We move all terms to the left:
-2(4-d)-(10)=0
We add all the numbers together, and all the variables
-2(-1d+4)-10=0
We multiply parentheses
2d-8-10=0
We add all the numbers together, and all the variables
2d-18=0
We move all terms containing d to the left, all other terms to the right
2d=18
d=18/2
d=9
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