7u-8=9u-20

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Solution for 7u-8=9u-20 equation: 



7u-8=9u-20

We move all terms to the left:

7u-8-(9u-20)=0

We get rid of parentheses

7u-9u+20-8=0

We add all the numbers together, and all the variables

-2u+12=0

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

-2u=-12

u=-12/-2

u=+6

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