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2u+4(u+6)=-18
We move all terms to the left:
2u+4(u+6)-(-18)=0
We add all the numbers together, and all the variables
2u+4(u+6)+18=0
We multiply parentheses
2u+4u+24+18=0
We add all the numbers together, and all the variables
6u+42=0
We move all terms containing u to the left, all other terms to the right
6u=-42
u=-42/6
u=-7
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