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6u-11=21+2u
We move all terms to the left:
6u-11-(21+2u)=0
We add all the numbers together, and all the variables
6u-(2u+21)-11=0
We get rid of parentheses
6u-2u-21-11=0
We add all the numbers together, and all the variables
4u-32=0
We move all terms containing u to the left, all other terms to the right
4u=32
u=32/4
u=8
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