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48=3d+2d+2d+d
We move all terms to the left:
48-(3d+2d+2d+d)=0
We add all the numbers together, and all the variables
-(+8d)+48=0
We get rid of parentheses
-8d+48=0
We move all terms containing d to the left, all other terms to the right
-8d=-48
d=-48/-8
d=+6
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