-4a+9=-2(4+5a)-7

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Solution for -4a+9=-2(4+5a)-7 equation: 



-4a+9=-2(4+5a)-7

We move all terms to the left:

-4a+9-(-2(4+5a)-7)=0

We add all the numbers together, and all the variables

-4a-(-2(5a+4)-7)+9=0



We calculate terms in parentheses: -(-2(5a+4)-7), so:

-2(5a+4)-7

We multiply parentheses

-10a-8-7

We add all the numbers together, and all the variables

-10a-15

Back to the equation:

-(-10a-15)



We get rid of parentheses

-4a+10a+15+9=0

We add all the numbers together, and all the variables

6a+24=0

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

6a=-24

a=-24/6

a=-4

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