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5u+16=3u+6u=12
We move all terms to the left:
5u+16-(3u+6u)=0
We add all the numbers together, and all the variables
5u-(+9u)+16=0
We get rid of parentheses
5u-9u+16=0
We add all the numbers together, and all the variables
-4u+16=0
We move all terms containing u to the left, all other terms to the right
-4u=-16
u=-16/-4
u=+4
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