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-8u+-16=-16u+20
We move all terms to the left:
-8u+-16-(-16u+20)=0
We add all the numbers together, and all the variables
-8u-(-16u+20)=0
We get rid of parentheses
-8u+16u-20=0
We add all the numbers together, and all the variables
8u-20=0
We move all terms containing u to the left, all other terms to the right
8u=20
u=20/8
u=2+1/2
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