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-u=4u+10
We move all terms to the left:
-u-(4u+10)=0
We add all the numbers together, and all the variables
-1u-(4u+10)=0
We get rid of parentheses
-1u-4u-10=0
We add all the numbers together, and all the variables
-5u-10=0
We move all terms containing u to the left, all other terms to the right
-5u=10
u=10/-5
u=-2
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