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900+50d=2530-160d
We move all terms to the left:
900+50d-(2530-160d)=0
We add all the numbers together, and all the variables
50d-(-160d+2530)+900=0
We get rid of parentheses
50d+160d-2530+900=0
We add all the numbers together, and all the variables
210d-1630=0
We move all terms containing d to the left, all other terms to the right
210d=1630
d=1630/210
d=7+16/21
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