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-(2d-1)+3(d+2)=7
We move all terms to the left:
-(2d-1)+3(d+2)-(7)=0
We multiply parentheses
-(2d-1)+3d+6-7=0
We get rid of parentheses
-2d+3d+1+6-7=0
We add all the numbers together, and all the variables
d=0
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