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-7u+3(u+4)=-4
We move all terms to the left:
-7u+3(u+4)-(-4)=0
We add all the numbers together, and all the variables
-7u+3(u+4)+4=0
We multiply parentheses
-7u+3u+12+4=0
We add all the numbers together, and all the variables
-4u+16=0
We move all terms containing u to the left, all other terms to the right
-4u=-16
u=-16/-4
u=+4
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