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168=280-u
We move all terms to the left:
168-(280-u)=0
We add all the numbers together, and all the variables
-(-1u+280)+168=0
We get rid of parentheses
1u-280+168=0
We add all the numbers together, and all the variables
u-112=0
We move all terms containing u to the left, all other terms to the right
u=112
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