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148=217-u
We move all terms to the left:
148-(217-u)=0
We add all the numbers together, and all the variables
-(-1u+217)+148=0
We get rid of parentheses
1u-217+148=0
We add all the numbers together, and all the variables
u-69=0
We move all terms containing u to the left, all other terms to the right
u=69
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