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-6(u+4)=-8u-42
We move all terms to the left:
-6(u+4)-(-8u-42)=0
We multiply parentheses
-6u-(-8u-42)-24=0
We get rid of parentheses
-6u+8u+42-24=0
We add all the numbers together, and all the variables
2u+18=0
We move all terms containing u to the left, all other terms to the right
2u=-18
u=-18/2
u=-9
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