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