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2(u=5)-5u

We move all terms to the left:

2(u-(5)-5u)=0

We add all the numbers together, and all the variables

2(-4u-5)=0

We multiply parentheses

-8u-10=0

We move all terms containing u to the left, all other terms to the right

-8u=10

u=10/-8

u=-1+1/4

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