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240=6d-54
We move all terms to the left:
240-(6d-54)=0
We get rid of parentheses
-6d+54+240=0
We add all the numbers together, and all the variables
-6d+294=0
We move all terms containing d to the left, all other terms to the right
-6d=-294
d=-294/-6
d=+49
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