7x+8x-21=63-6x

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Solution for 7x+8x-21=63-6x equation: 



7x+8x-21=63-6x

We move all terms to the left:

7x+8x-21-(63-6x)=0

We add all the numbers together, and all the variables

7x+8x-(-6x+63)-21=0

We add all the numbers together, and all the variables

15x-(-6x+63)-21=0

We get rid of parentheses

15x+6x-63-21=0

We add all the numbers together, and all the variables

21x-84=0

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

21x=84

x=84/21

x=4

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