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2u-6=4u-20
We move all terms to the left:
2u-6-(4u-20)=0
We get rid of parentheses
2u-4u+20-6=0
We add all the numbers together, and all the variables
-2u+14=0
We move all terms containing u to the left, all other terms to the right
-2u=-14
u=-14/-2
u=+7
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