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-7d=50+3d
We move all terms to the left:
-7d-(50+3d)=0
We add all the numbers together, and all the variables
-7d-(3d+50)=0
We get rid of parentheses
-7d-3d-50=0
We add all the numbers together, and all the variables
-10d-50=0
We move all terms containing d to the left, all other terms to the right
-10d=50
d=50/-10
d=-5
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