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-3d=7d+25
We move all terms to the left:
-3d-(7d+25)=0
We get rid of parentheses
-3d-7d-25=0
We add all the numbers together, and all the variables
-10d-25=0
We move all terms containing d to the left, all other terms to the right
-10d=25
d=25/-10
d=-2+1/2
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