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4(u+7)-7u=7
We move all terms to the left:
4(u+7)-7u-(7)=0
We add all the numbers together, and all the variables
-7u+4(u+7)-7=0
We multiply parentheses
-7u+4u+28-7=0
We add all the numbers together, and all the variables
-3u+21=0
We move all terms containing u to the left, all other terms to the right
-3u=-21
u=-21/-3
u=+7
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