12x-5-3x=40

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Solution for 12x-5-3x=40 equation: 



12x-5-3x=40

We move all terms to the left:

12x-5-3x-(40)=0

We add all the numbers together, and all the variables

9x-45=0

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

9x=45

x=45/9

x=5

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