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2u+5(u+5)=4
We move all terms to the left:
2u+5(u+5)-(4)=0
We multiply parentheses
2u+5u+25-4=0
We add all the numbers together, and all the variables
7u+21=0
We move all terms containing u to the left, all other terms to the right
7u=-21
u=-21/7
u=-3
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