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-6u+3(u+7)=33
We move all terms to the left:
-6u+3(u+7)-(33)=0
We multiply parentheses
-6u+3u+21-33=0
We add all the numbers together, and all the variables
-3u-12=0
We move all terms containing u to the left, all other terms to the right
-3u=12
u=12/-3
u=-4
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