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8u-20=10u-34
We move all terms to the left:
8u-20-(10u-34)=0
We get rid of parentheses
8u-10u+34-20=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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