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18=-5+7d
We move all terms to the left:
18-(-5+7d)=0
We add all the numbers together, and all the variables
-(7d-5)+18=0
We get rid of parentheses
-7d+5+18=0
We add all the numbers together, and all the variables
-7d+23=0
We move all terms containing d to the left, all other terms to the right
-7d=-23
d=-23/-7
d=3+2/7
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