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-5(u+-6)=20
We move all terms to the left:
-5(u+-6)-(20)=0
We add all the numbers together, and all the variables
-5(u-6)-20=0
We multiply parentheses
-5u+30-20=0
We add all the numbers together, and all the variables
-5u+10=0
We move all terms containing u to the left, all other terms to the right
-5u=-10
u=-10/-5
u=+2
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