Answer:
7
Explanation:
First multiply 6 by u and 7 to get 6u+7
next add -8u + 6u and get -2u
then subtract 42 from both sides of the equation (28-42)
finally divide -2u from both sides of the equation and get 7
-8u-16=-6u+30
-8u+6u=30+16
-2u=46
u=-46/2
u=-23
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