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13=10+u/4
We move all terms to the left:
13-(10+u/4)=0
We add all the numbers together, and all the variables
-(u/4+10)+13=0
We get rid of parentheses
-u/4-10+13=0
We multiply all the terms by the denominator
-u-10*4+13*4=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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