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5=3+u/2.56
We move all terms to the left:
5-(3+u/2.56)=0
We add all the numbers together, and all the variables
-(u/2.56+3)+5=0
We get rid of parentheses
-u/2.56-3+5=0
We multiply all the terms by the denominator
-u-3*2.56+5*2.56=0
We add all the numbers together, and all the variables
-1u+5.12=0
We move all terms containing u to the left, all other terms to the right
-u=-5.12
u=-5.12/-1
u=5+0.12/1
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