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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

13x-(-8x+63)-21=0

We get rid of parentheses

13x+8x-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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