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-4a+30+8a=3a-9a
We move all terms to the left:
-4a+30+8a-(3a-9a)=0
We add all the numbers together, and all the variables
-4a+8a-(-6a)+30=0
We add all the numbers together, and all the variables
4a-(-6a)+30=0
We get rid of parentheses
4a+6a+30=0
We add all the numbers together, and all the variables
10a+30=0
We move all terms containing a to the left, all other terms to the right
10a=-30
a=-30/10
a=-3
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