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3.25=1+.75d
We move all terms to the left:
3.25-(1+.75d)=0
We add all the numbers together, and all the variables
-(.75d+1)+3.25=0
We get rid of parentheses
-.75d-1+3.25=0
We add all the numbers together, and all the variables
-0.75d+2.25=0
We move all terms containing d to the left, all other terms to the right
-0.75d=-2.25
d=-2.25/-0.75
d=+3
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