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5.1+2.7=3.9d-2.7
We move all terms to the left:
5.1+2.7-(3.9d-2.7)=0
We add all the numbers together, and all the variables
-(3.9d-2.7)+7.8=0
We get rid of parentheses
-3.9d+2.7+7.8=0
We add all the numbers together, and all the variables
-3.9d+10.5=0
We move all terms containing d to the left, all other terms to the right
-3.9d=-10.5
d=-10.5/-3.9
d=2+2.7/3.9
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