4x-21=2x+39

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Solution for 4x-21=2x+39 equation: 



4x-21=2x+39

We move all terms to the left:

4x-21-(2x+39)=0

We get rid of parentheses

4x-2x-39-21=0

We add all the numbers together, and all the variables

2x-60=0

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

2x=60

x=60/2

x=30

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