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5415=15.75+3.2d
We move all terms to the left:
5415-(15.75+3.2d)=0
We add all the numbers together, and all the variables
-(3.2d+15.75)+5415=0
We get rid of parentheses
-3.2d-15.75+5415=0
We add all the numbers together, and all the variables
-3.2d+5399.25=0
We move all terms containing d to the left, all other terms to the right
-3.2d=-5399.25
d=-5399.25/-3.2
d=1687+0.84999999999945/3.2
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