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163=20-u
We move all terms to the left:
163-(20-u)=0
We add all the numbers together, and all the variables
-(-1u+20)+163=0
We get rid of parentheses
1u-20+163=0
We add all the numbers together, and all the variables
u+143=0
We move all terms containing u to the left, all other terms to the right
u=-143
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