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-4u-9=7-6u
We move all terms to the left:
-4u-9-(7-6u)=0
We add all the numbers together, and all the variables
-4u-(-6u+7)-9=0
We get rid of parentheses
-4u+6u-7-9=0
We add all the numbers together, and all the variables
2u-16=0
We move all terms containing u to the left, all other terms to the right
2u=16
u=16/2
u=8
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