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-2u+4=4-5u
We move all terms to the left:
-2u+4-(4-5u)=0
We add all the numbers together, and all the variables
-2u-(-5u+4)+4=0
We get rid of parentheses
-2u+5u-4+4=0
We add all the numbers together, and all the variables
3u=0
u=0/3
u=0
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