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9=-5+u/2
We move all terms to the left:
9-(-5+u/2)=0
We add all the numbers together, and all the variables
-(u/2-5)+9=0
We get rid of parentheses
-u/2+5+9=0
We multiply all the terms by the denominator
-u+5*2+9*2=0
We add all the numbers together, and all the variables
-1u+28=0
We move all terms containing u to the left, all other terms to the right
-u=-28
u=-28/-1
u=+28
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