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230+12d=790-8d
We move all terms to the left:
230+12d-(790-8d)=0
We add all the numbers together, and all the variables
12d-(-8d+790)+230=0
We get rid of parentheses
12d+8d-790+230=0
We add all the numbers together, and all the variables
20d-560=0
We move all terms containing d to the left, all other terms to the right
20d=560
d=560/20
d=28
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