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580+29d=490+35d
We move all terms to the left:
580+29d-(490+35d)=0
We add all the numbers together, and all the variables
29d-(35d+490)+580=0
We get rid of parentheses
29d-35d-490+580=0
We add all the numbers together, and all the variables
-6d+90=0
We move all terms containing d to the left, all other terms to the right
-6d=-90
d=-90/-6
d=+15
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