5x-21=4x-15=180

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Solution for 5x-21=4x-15=180 equation: 



5x-21=4x-15=180

We move all terms to the left:

5x-21-(4x-15)=0

We get rid of parentheses

5x-4x+15-21=0

We add all the numbers together, and all the variables

x-6=0

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

x=6

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