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172=105-u
We move all terms to the left:
172-(105-u)=0
We add all the numbers together, and all the variables
-(-1u+105)+172=0
We get rid of parentheses
1u-105+172=0
We add all the numbers together, and all the variables
u+67=0
We move all terms containing u to the left, all other terms to the right
u=-67
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