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-1=-3+u/2
We move all terms to the left:
-1-(-3+u/2)=0
We add all the numbers together, and all the variables
-(u/2-3)-1=0
We get rid of parentheses
-u/2+3-1=0
We multiply all the terms by the denominator
-u+3*2-1*2=0
We add all the numbers together, and all the variables
-1u+4=0
We move all terms containing u to the left, all other terms to the right
-u=-4
u=-4/-1
u=+4
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