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-8u+5(u+5)=28
We move all terms to the left:
-8u+5(u+5)-(28)=0
We multiply parentheses
-8u+5u+25-28=0
We add all the numbers together, and all the variables
-3u-3=0
We move all terms containing u to the left, all other terms to the right
-3u=3
u=3/-3
u=-1
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