3x+21=7x-39

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Solution for 3x+21=7x-39 equation: 



3x+21=7x-39

We move all terms to the left:

3x+21-(7x-39)=0

We get rid of parentheses

3x-7x+39+21=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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