-2a+21=-6(2a-3)-7

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Solution for -2a+21=-6(2a-3)-7 equation: 



-2a+21=-6(2a-3)-7

We move all terms to the left:

-2a+21-(-6(2a-3)-7)=0



We calculate terms in parentheses: -(-6(2a-3)-7), so:

-6(2a-3)-7

We multiply parentheses

-12a+18-7

We add all the numbers together, and all the variables

-12a+11

Back to the equation:

-(-12a+11)



We get rid of parentheses

-2a+12a-11+21=0

We add all the numbers together, and all the variables

10a+10=0

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

10a=-10

a=-10/10

a=-1

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