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5u+(-13u)+3=19
We move all terms to the left:
5u+(-13u)+3-(19)=0
We add all the numbers together, and all the variables
5u+(-13u)-16=0
We get rid of parentheses
5u-13u-16=0
We add all the numbers together, and all the variables
-8u-16=0
We move all terms containing u to the left, all other terms to the right
-8u=16
u=16/-8
u=-2
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