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2u+8(u-4)=38
We move all terms to the left:
2u+8(u-4)-(38)=0
We multiply parentheses
2u+8u-32-38=0
We add all the numbers together, and all the variables
10u-70=0
We move all terms containing u to the left, all other terms to the right
10u=70
u=70/10
u=7
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