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-4u=-9-5u
We move all terms to the left:
-4u-(-9-5u)=0
We add all the numbers together, and all the variables
-4u-(-5u-9)=0
We get rid of parentheses
-4u+5u+9=0
We add all the numbers together, and all the variables
u+9=0
We move all terms containing u to the left, all other terms to the right
u=-9
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