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-6u-15u=15u-8u+4u
We move all terms to the left:
-6u-15u-(15u-8u+4u)=0
We add all the numbers together, and all the variables
-6u-15u-(+11u)=0
We add all the numbers together, and all the variables
-21u-(+11u)=0
We get rid of parentheses
-21u-11u=0
We add all the numbers together, and all the variables
-32u=0
u=0/-32
u=0
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