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-6(2a+3)=30
We move all terms to the left:
-6(2a+3)-(30)=0
We multiply parentheses
-12a-18-30=0
We add all the numbers together, and all the variables
-12a-48=0
We move all terms containing a to the left, all other terms to the right
-12a=48
a=48/-12
a=-4
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