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2=2d+50
We move all terms to the left:
2-(2d+50)=0
We get rid of parentheses
-2d-50+2=0
We add all the numbers together, and all the variables
-2d-48=0
We move all terms containing d to the left, all other terms to the right
-2d=48
d=48/-2
d=-24
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