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-10=3.5+d
We move all terms to the left:
-10-(3.5+d)=0
We add all the numbers together, and all the variables
-(d+3.5)-10=0
We get rid of parentheses
-d-3.5-10=0
We add all the numbers together, and all the variables
-1d-13.5=0
We move all terms containing d to the left, all other terms to the right
-d=13.5
d=13.5/-1
d=-13+0.5/1
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