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287=40-u
We move all terms to the left:
287-(40-u)=0
We add all the numbers together, and all the variables
-(-1u+40)+287=0
We get rid of parentheses
1u-40+287=0
We add all the numbers together, and all the variables
u+247=0
We move all terms containing u to the left, all other terms to the right
u=-247
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