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-4=2u-6
We move all terms to the left:
-4-(2u-6)=0
We get rid of parentheses
-2u+6-4=0
We add all the numbers together, and all the variables
-2u+2=0
We move all terms containing u to the left, all other terms to the right
-2u=-2
u=-2/-2
u=1
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