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48=-u+269
We move all terms to the left:
48-(-u+269)=0
We add all the numbers together, and all the variables
-(-1u+269)+48=0
We get rid of parentheses
1u-269+48=0
We add all the numbers together, and all the variables
u-221=0
We move all terms containing u to the left, all other terms to the right
u=221
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