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4x+5x=x+8

We move all terms to the left:

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

We add all the numbers together, and all the variables

9x-(x+8)=0

We get rid of parentheses

9x-x-8=0

We add all the numbers together, and all the variables

8x-8=0

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

8x=8

x=8/8

x=1

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