7a+9-12a=-4-1-3a

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Solution for 7a+9-12a=-4-1-3a equation: 



7a+9-12a=-4-1-3a

We move all terms to the left:

7a+9-12a-(-4-1-3a)=0

We add all the numbers together, and all the variables

7a-12a-(-3a-5)+9=0

We add all the numbers together, and all the variables

-5a-(-3a-5)+9=0

We get rid of parentheses

-5a+3a+5+9=0

We add all the numbers together, and all the variables

-2a+14=0

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

-2a=-14

a=-14/-2

a=+7

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