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5d+7.75=4+2.75d
We move all terms to the left:
5d+7.75-(4+2.75d)=0
We add all the numbers together, and all the variables
5d-(2.75d+4)+7.75=0
We get rid of parentheses
5d-2.75d-4+7.75=0
We add all the numbers together, and all the variables
2.25d+3.75=0
We move all terms containing d to the left, all other terms to the right
2.25d=-3.75
d=-3.75/2.25
d=-1+1/1.5
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