x+x-12=40

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Solution for x+x-12=40 equation: 



x+x-12=40

We move all terms to the left:

x+x-12-(40)=0

We add all the numbers together, and all the variables

2x-52=0

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

2x=52

x=52/2

x=26

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