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198=148-u
We move all terms to the left:
198-(148-u)=0
We add all the numbers together, and all the variables
-(-1u+148)+198=0
We get rid of parentheses
1u-148+198=0
We add all the numbers together, and all the variables
u+50=0
We move all terms containing u to the left, all other terms to the right
u=-50
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