4x-21=39

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Solution for 4x-21=39 equation: 



4x-21=39

We move all terms to the left:

4x-21-(39)=0

We add all the numbers together, and all the variables

4x-60=0

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

4x=60

x=60/4

x=15

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