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19=5-7u
We move all terms to the left:
19-(5-7u)=0
We add all the numbers together, and all the variables
-(-7u+5)+19=0
We get rid of parentheses
7u-5+19=0
We add all the numbers together, and all the variables
7u+14=0
We move all terms containing u to the left, all other terms to the right
7u=-14
u=-14/7
u=-2
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