8x+3x-9x=9+3

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Solution for 8x+3x-9x=9+3 equation: 



8x+3x-9x=9+3

We move all terms to the left:

8x+3x-9x-(9+3)=0

We add all the numbers together, and all the variables

8x+3x-9x-12=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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