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125=13+3d
We move all terms to the left:
125-(13+3d)=0
We add all the numbers together, and all the variables
-(3d+13)+125=0
We get rid of parentheses
-3d-13+125=0
We add all the numbers together, and all the variables
-3d+112=0
We move all terms containing d to the left, all other terms to the right
-3d=-112
d=-112/-3
d=37+1/3
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