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(x+6)-(x+7)-3=9
We move all terms to the left:
(x+6)-(x+7)-3-(9)=0
We add all the numbers together, and all the variables
(x+6)-(x+7)-12=0
We get rid of parentheses
x-x+6-7-12=0
We add all the numbers together, and all the variables
-13!=0
There is no solution for this equation
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