8x-5x+9+21=18.

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Solution for 8x-5x+9+21=18. equation: 



8x-5x+9+21=18.

We move all terms to the left:

8x-5x+9+21-(18.)=0

We add all the numbers together, and all the variables

8x-5x+9+21-18=0

We add all the numbers together, and all the variables

3x+12=0

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

3x=-12

x=-12/3

x=-4

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