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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

7x-(-8(+2x)+4x)+12-21=0

We add all the numbers together, and all the variables

7x-(-8(+2x)+4x)-9=0



We calculate terms in parentheses: -(-8(+2x)+4x), so:

-8(+2x)+4x

We add all the numbers together, and all the variables

4x-8(+2x)

We multiply parentheses

4x-16x

We add all the numbers together, and all the variables

-12x

Back to the equation:

-(-12x)



We get rid of parentheses

7x+12x-9=0

We add all the numbers together, and all the variables

19x-9=0

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

19x=9

x=9/19

x=9/19

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