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-u+(-4u)+12u=-14
We move all terms to the left:
-u+(-4u)+12u-(-14)=0
We add all the numbers together, and all the variables
11u+(-4u)+14=0
We get rid of parentheses
11u-4u+14=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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