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172=217-u
We move all terms to the left:
172-(217-u)=0
We add all the numbers together, and all the variables
-(-1u+217)+172=0
We get rid of parentheses
1u-217+172=0
We add all the numbers together, and all the variables
u-45=0
We move all terms containing u to the left, all other terms to the right
u=45
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