x+x+x+12=180

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Solution for x+x+x+12=180 equation: 



x+x+x+12=180

We move all terms to the left:

x+x+x+12-(180)=0

We add all the numbers together, and all the variables

3x-168=0

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

3x=168

x=168/3

x=56

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