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5=240-u
We move all terms to the left:
5-(240-u)=0
We add all the numbers together, and all the variables
-(-1u+240)+5=0
We get rid of parentheses
1u-240+5=0
We add all the numbers together, and all the variables
u-235=0
We move all terms containing u to the left, all other terms to the right
u=235
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