8x-21=18-5x

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Solution for 8x-21=18-5x equation: 



8x-21=18-5x

We move all terms to the left:

8x-21-(18-5x)=0

We add all the numbers together, and all the variables

8x-(-5x+18)-21=0

We get rid of parentheses

8x+5x-18-21=0

We add all the numbers together, and all the variables

13x-39=0

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

13x=39

x=39/13

x=3

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