3x-21=7x-14

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Solution for 3x-21=7x-14 equation: 



3x-21=7x-14

We move all terms to the left:

3x-21-(7x-14)=0

We get rid of parentheses

3x-7x+14-21=0

We add all the numbers together, and all the variables

-4x-7=0

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

-4x=7

x=7/-4

x=-1+3/4

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