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199=-u+43
We move all terms to the left:
199-(-u+43)=0
We add all the numbers together, and all the variables
-(-1u+43)+199=0
We get rid of parentheses
1u-43+199=0
We add all the numbers together, and all the variables
u+156=0
We move all terms containing u to the left, all other terms to the right
u=-156
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