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3x-17=5x+21=180

We move all terms to the left:

3x-17-(5x+21)=0

We get rid of parentheses

3x-5x-21-17=0

We add all the numbers together, and all the variables

-2x-38=0

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

-2x=38

x=38/-2

x=-19

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