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40+60d=40d-280
We move all terms to the left:
40+60d-(40d-280)=0
We get rid of parentheses
60d-40d+280+40=0
We add all the numbers together, and all the variables
20d+320=0
We move all terms containing d to the left, all other terms to the right
20d=-320
d=-320/20
d=-16
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