21-a=-6(4-2a)+2a

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Solution for 21-a=-6(4-2a)+2a equation: 



21-a=-6(4-2a)+2a

We move all terms to the left:

21-a-(-6(4-2a)+2a)=0

We add all the numbers together, and all the variables

-a-(-6(-2a+4)+2a)+21=0

We add all the numbers together, and all the variables

-1a-(-6(-2a+4)+2a)+21=0



We calculate terms in parentheses: -(-6(-2a+4)+2a), so:

-6(-2a+4)+2a

We add all the numbers together, and all the variables

2a-6(-2a+4)

We multiply parentheses

2a+12a-24

We add all the numbers together, and all the variables

14a-24

Back to the equation:

-(14a-24)



We get rid of parentheses

-1a-14a+24+21=0

We add all the numbers together, and all the variables

-15a+45=0

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

-15a=-45

a=-45/-15

a=+3

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