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40=2u+8
We move all terms to the left:
40-(2u+8)=0
We get rid of parentheses
-2u-8+40=0
We add all the numbers together, and all the variables
-2u+32=0
We move all terms containing u to the left, all other terms to the right
-2u=-32
u=-32/-2
u=+16
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