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246=200-u
We move all terms to the left:
246-(200-u)=0
We add all the numbers together, and all the variables
-(-1u+200)+246=0
We get rid of parentheses
1u-200+246=0
We add all the numbers together, and all the variables
u+46=0
We move all terms containing u to the left, all other terms to the right
u=-46
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