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-3(4-5a)=30-6a
We move all terms to the left:
-3(4-5a)-(30-6a)=0
We add all the numbers together, and all the variables
-3(-5a+4)-(-6a+30)=0
We multiply parentheses
15a-(-6a+30)-12=0
We get rid of parentheses
15a+6a-30-12=0
We add all the numbers together, and all the variables
21a-42=0
We move all terms containing a to the left, all other terms to the right
21a=42
a=42/21
a=2
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