4a+5a=3a-12

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Solution for 4a+5a=3a-12 equation: 



4a+5a=3a-12

We move all terms to the left:

4a+5a-(3a-12)=0

We add all the numbers together, and all the variables

9a-(3a-12)=0

We get rid of parentheses

9a-3a+12=0

We add all the numbers together, and all the variables

6a+12=0

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

6a=-12

a=-12/6

a=-2

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