x-12+x=72

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Solution for x-12+x=72 equation: 



x-12+x=72

We move all terms to the left:

x-12+x-(72)=0

We add all the numbers together, and all the variables

2x-84=0

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

2x=84

x=84/2

x=42

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