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13=3+u/2
We move all terms to the left:
13-(3+u/2)=0
We add all the numbers together, and all the variables
-(u/2+3)+13=0
We get rid of parentheses
-u/2-3+13=0
We multiply all the terms by the denominator
-u-3*2+13*2=0
We add all the numbers together, and all the variables
-1u+20=0
We move all terms containing u to the left, all other terms to the right
-u=-20
u=-20/-1
u=+20
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