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8+2.5=3.5d
We move all terms to the left:
8+2.5-(3.5d)=0
We add all the numbers together, and all the variables
-(+3.5d)+8+2.5=0
We add all the numbers together, and all the variables
-(+3.5d)+10.5=0
We get rid of parentheses
-3.5d+10.5=0
We move all terms containing d to the left, all other terms to the right
-3.5d=-10.5
d=-10.5/-3.5
d=+3
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