8x-21=7x-3x

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Solution for 8x-21=7x-3x equation: 



8x-21=7x-3x

We move all terms to the left:

8x-21-(7x-3x)=0

We add all the numbers together, and all the variables

8x-(+4x)-21=0

We get rid of parentheses

8x-4x-21=0

We add all the numbers together, and all the variables

4x-21=0

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

4x=21

x=21/4

x=5+1/4

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