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-4u=-2u-8
We move all terms to the left:
-4u-(-2u-8)=0
We get rid of parentheses
-4u+2u+8=0
We add all the numbers together, and all the variables
-2u+8=0
We move all terms containing u to the left, all other terms to the right
-2u=-8
u=-8/-2
u=+4
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