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259=153-u
We move all terms to the left:
259-(153-u)=0
We add all the numbers together, and all the variables
-(-1u+153)+259=0
We get rid of parentheses
1u-153+259=0
We add all the numbers together, and all the variables
u+106=0
We move all terms containing u to the left, all other terms to the right
u=-106
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