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-2u+4(u+4)=20
We move all terms to the left:
-2u+4(u+4)-(20)=0
We multiply parentheses
-2u+4u+16-20=0
We add all the numbers together, and all the variables
2u-4=0
We move all terms containing u to the left, all other terms to the right
2u=4
u=4/2
u=2
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