13u+2u-15u+3u+u=20

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Solution for 13u+2u-15u+3u+u=20 equation: 



13u+2u-15u+3u+u=20

We move all terms to the left:

13u+2u-15u+3u+u-(20)=0

We add all the numbers together, and all the variables

4u-20=0

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

4u=20

u=20/4

u=5

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