12x-9=5x-40

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Solution for 12x-9=5x-40 equation: 



12x-9=5x-40

We move all terms to the left:

12x-9-(5x-40)=0

We get rid of parentheses

12x-5x+40-9=0

We add all the numbers together, and all the variables

7x+31=0

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

7x=-31

x=-31/7

x=-4+3/7

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