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d+0.5=0.75d+0.5=0.7
We move all terms to the left:
d+0.5-(0.75d+0.5)=0
We get rid of parentheses
d-0.75d-0.5+0.5=0
We add all the numbers together, and all the variables
0.25d=0
d=0/0.25
d=0
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