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-6u+2(u+6)=28
We move all terms to the left:
-6u+2(u+6)-(28)=0
We multiply parentheses
-6u+2u+12-28=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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