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19=4+u/3
We move all terms to the left:
19-(4+u/3)=0
We add all the numbers together, and all the variables
-(u/3+4)+19=0
We get rid of parentheses
-u/3-4+19=0
We multiply all the terms by the denominator
-u-4*3+19*3=0
We add all the numbers together, and all the variables
-1u+45=0
We move all terms containing u to the left, all other terms to the right
-u=-45
u=-45/-1
u=+45
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