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4(u+9)=-9u-3
We move all terms to the left:
4(u+9)-(-9u-3)=0
We multiply parentheses
4u-(-9u-3)+36=0
We get rid of parentheses
4u+9u+3+36=0
We add all the numbers together, and all the variables
13u+39=0
We move all terms containing u to the left, all other terms to the right
13u=-39
u=-39/13
u=-3
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