-21=5(x-3)-8x

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Solution for -21=5(x-3)-8x equation: 



-21=5(x-3)-8x

We move all terms to the left:

-21-(5(x-3)-8x)=0



We calculate terms in parentheses: -(5(x-3)-8x), so:

5(x-3)-8x

We add all the numbers together, and all the variables

-8x+5(x-3)

We multiply parentheses

-8x+5x-15

We add all the numbers together, and all the variables

-3x-15

Back to the equation:

-(-3x-15)



We get rid of parentheses

3x+15-21=0

We add all the numbers together, and all the variables

3x-6=0

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

3x=6

x=6/3

x=2

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