12+4x+9x-8=40

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Solution for 12+4x+9x-8=40 equation: 



12+4x+9x-8=40

We move all terms to the left:

12+4x+9x-8-(40)=0

We add all the numbers together, and all the variables

13x-36=0

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

13x=36

x=36/13

x=2+10/13

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