21-4x=-7(x+8)-8x

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Solution for 21-4x=-7(x+8)-8x equation: 



21-4x=-7(x+8)-8x

We move all terms to the left:

21-4x-(-7(x+8)-8x)=0



We calculate terms in parentheses: -(-7(x+8)-8x), so:

-7(x+8)-8x

We add all the numbers together, and all the variables

-8x-7(x+8)

We multiply parentheses

-8x-7x-56

We add all the numbers together, and all the variables

-15x-56

Back to the equation:

-(-15x-56)



We get rid of parentheses

-4x+15x+56+21=0

We add all the numbers together, and all the variables

11x+77=0

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

11x=-77

x=-77/11

x=-7

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