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9x-4=8x+5x

We move all terms to the left:

9x-4-(8x+5x)=0

We add all the numbers together, and all the variables

9x-(+13x)-4=0

We get rid of parentheses

9x-13x-4=0

We add all the numbers together, and all the variables

-4x-4=0

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

-4x=4

x=4/-4

x=-1

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