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2d+50=-7d
We move all terms to the left:
2d+50-(-7d)=0
We get rid of parentheses
2d+7d+50=0
We add all the numbers together, and all the variables
9d+50=0
We move all terms containing d to the left, all other terms to the right
9d=-50
d=-50/9
d=-5+5/9
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