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12u+48=9-u
We move all terms to the left:
12u+48-(9-u)=0
We add all the numbers together, and all the variables
12u-(-1u+9)+48=0
We get rid of parentheses
12u+1u-9+48=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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