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68=-u+159
We move all terms to the left:
68-(-u+159)=0
We add all the numbers together, and all the variables
-(-1u+159)+68=0
We get rid of parentheses
1u-159+68=0
We add all the numbers together, and all the variables
u-91=0
We move all terms containing u to the left, all other terms to the right
u=91
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