x+x=42=180

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Solution for x+x=42=180 equation: 



x+x=42=180

We move all terms to the left:

x+x-(42)=0

We add all the numbers together, and all the variables

2x-42=0

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

2x=42

x=42/2

x=21

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