11u-9u+3u+4u-7u=20

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Solution for 11u-9u+3u+4u-7u=20 equation: 



11u-9u+3u+4u-7u=20

We move all terms to the left:

11u-9u+3u+4u-7u-(20)=0

We add all the numbers together, and all the variables

2u-20=0

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

2u=20

u=20/2

u=10

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