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-6u+8(u+5)=28
We move all terms to the left:
-6u+8(u+5)-(28)=0
We multiply parentheses
-6u+8u+40-28=0
We add all the numbers together, and all the variables
2u+12=0
We move all terms containing u to the left, all other terms to the right
2u=-12
u=-12/2
u=-6
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