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130=232-u
We move all terms to the left:
130-(232-u)=0
We add all the numbers together, and all the variables
-(-1u+232)+130=0
We get rid of parentheses
1u-232+130=0
We add all the numbers together, and all the variables
u-102=0
We move all terms containing u to the left, all other terms to the right
u=102
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