12-7x-21=-8(3-x)+4x

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Solution for 12-7x-21=-8(3-x)+4x equation: 



12-7x-21=-8(3-x)+4x

We move all terms to the left:

12-7x-21-(-8(3-x)+4x)=0

We add all the numbers together, and all the variables

-7x-(-8(-1x+3)+4x)+12-21=0

We add all the numbers together, and all the variables

-7x-(-8(-1x+3)+4x)-9=0



We calculate terms in parentheses: -(-8(-1x+3)+4x), so:

-8(-1x+3)+4x

We add all the numbers together, and all the variables

4x-8(-1x+3)

We multiply parentheses

4x+8x-24

We add all the numbers together, and all the variables

12x-24

Back to the equation:

-(12x-24)



We get rid of parentheses

-7x-12x+24-9=0

We add all the numbers together, and all the variables

-19x+15=0

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

-19x=-15

x=-15/-19

x=15/19

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