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5d+7-2d=-6+7d-15
We move all terms to the left:
5d+7-2d-(-6+7d-15)=0
We add all the numbers together, and all the variables
5d-2d-(7d-21)+7=0
We add all the numbers together, and all the variables
3d-(7d-21)+7=0
We get rid of parentheses
3d-7d+21+7=0
We add all the numbers together, and all the variables
-4d+28=0
We move all terms containing d to the left, all other terms to the right
-4d=-28
d=-28/-4
d=+7
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