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=150-3D+150
We move all terms to the left:
-(150-3D+150)=0
We add all the numbers together, and all the variables
-(-3D+300)=0
We get rid of parentheses
3D-300=0
We move all terms containing D to the left, all other terms to the right
3D=300
D=300/3
D=100
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