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49=13+6d
We move all terms to the left:
49-(13+6d)=0
We add all the numbers together, and all the variables
-(6d+13)+49=0
We get rid of parentheses
-6d-13+49=0
We add all the numbers together, and all the variables
-6d+36=0
We move all terms containing d to the left, all other terms to the right
-6d=-36
d=-36/-6
d=+6
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