8x+6x-21=84-7x

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Solution for 8x+6x-21=84-7x equation: 



8x+6x-21=84-7x

We move all terms to the left:

8x+6x-21-(84-7x)=0

We add all the numbers together, and all the variables

8x+6x-(-7x+84)-21=0

We add all the numbers together, and all the variables

14x-(-7x+84)-21=0

We get rid of parentheses

14x+7x-84-21=0

We add all the numbers together, and all the variables

21x-105=0

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

21x=105

x=105/21

x=5

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