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3.5d+7.75=4+4.75d
We move all terms to the left:
3.5d+7.75-(4+4.75d)=0
We add all the numbers together, and all the variables
3.5d-(4.75d+4)+7.75=0
We get rid of parentheses
3.5d-4.75d-4+7.75=0
We add all the numbers together, and all the variables
-1.25d+3.75=0
We move all terms containing d to the left, all other terms to the right
-1.25d=-3.75
d=-3.75/-1.25
d=+3
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