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3(D+5)=2D+15+D
We move all terms to the left:
3(D+5)-(2D+15+D)=0
We add all the numbers together, and all the variables
3(D+5)-(3D+15)=0
We multiply parentheses
3D-(3D+15)+15=0
We get rid of parentheses
3D-3D-15+15=0
We add all the numbers together, and all the variables
=0
D=0/1
D=0
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