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7-18u=11-11-18u
We move all terms to the left:
7-18u-(11-11-18u)=0
We add all the numbers together, and all the variables
-18u-(-18u)+7=0
We get rid of parentheses
-18u+18u+7=0
We add all the numbers together, and all the variables
7!=0
There is no solution for this equation
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