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230+7(12d)=790-7(8d)
We move all terms to the left:
230+7(12d)-(790-7(8d))=0
We add all the numbers together, and all the variables
712d-(-78d+790)+230=0
We get rid of parentheses
712d+78d-790+230=0
We add all the numbers together, and all the variables
790d-560=0
We move all terms containing d to the left, all other terms to the right
790d=560
d=560/790
d=56/79
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