9+8u=7u-4

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Solution for 9+8u=7u-4 equation: 



9+8u=7u-4

We move all terms to the left:

9+8u-(7u-4)=0

We get rid of parentheses

8u-7u+4+9=0

We add all the numbers together, and all the variables

u+13=0

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

u=-13

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