2x+21=x+9=180

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Solution for 2x+21=x+9=180 equation: 



2x+21=x+9=180

We move all terms to the left:

2x+21-(x+9)=0

We get rid of parentheses

2x-x-9+21=0

We add all the numbers together, and all the variables

x+12=0

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

x=-12

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