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75d+400=-25d+1000
We move all terms to the left:
75d+400-(-25d+1000)=0
We get rid of parentheses
75d+25d-1000+400=0
We add all the numbers together, and all the variables
100d-600=0
We move all terms containing d to the left, all other terms to the right
100d=600
d=600/100
d=6
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