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26=3d+10d
We move all terms to the left:
26-(3d+10d)=0
We add all the numbers together, and all the variables
-(+13d)+26=0
We get rid of parentheses
-13d+26=0
We move all terms containing d to the left, all other terms to the right
-13d=-26
d=-26/-13
d=+2
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