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3u+u=2-13
We move all terms to the left:
3u+u-(2-13)=0
We add all the numbers together, and all the variables
3u+u-(-11)=0
We add all the numbers together, and all the variables
4u+11=0
We move all terms containing u to the left, all other terms to the right
4u=-11
u=-11/4
u=-2+3/4
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