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450+30d=69+30d
We move all terms to the left:
450+30d-(69+30d)=0
We add all the numbers together, and all the variables
30d-(30d+69)+450=0
We get rid of parentheses
30d-30d-69+450=0
We add all the numbers together, and all the variables
381!=0
There is no solution for this equation
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