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6=10u-8u
We move all terms to the left:
6-(10u-8u)=0
We add all the numbers together, and all the variables
-(+2u)+6=0
We get rid of parentheses
-2u+6=0
We move all terms containing u to the left, all other terms to the right
-2u=-6
u=-6/-2
u=+3
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