4u+15-u=9-15-42

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Solution for 4u+15-u=9-15-42 equation: 



4u+15-u=9-15-42

We move all terms to the left:

4u+15-u-(9-15-42)=0

We add all the numbers together, and all the variables

4u-u+15-(-48)=0

We add all the numbers together, and all the variables

3u+63=0

We move all terms containing u to the left, all other terms to the right

3u=-63

u=-63/3

u=-21

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