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3+16=7D-11
We move all terms to the left:
3+16-(7D-11)=0
We add all the numbers together, and all the variables
-(7D-11)+19=0
We get rid of parentheses
-7D+11+19=0
We add all the numbers together, and all the variables
-7D+30=0
We move all terms containing D to the left, all other terms to the right
-7D=-30
D=-30/-7
D=4+2/7
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