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-6(-5a-2)=252
We move all terms to the left:
-6(-5a-2)-(252)=0
We multiply parentheses
30a+12-252=0
We add all the numbers together, and all the variables
30a-240=0
We move all terms containing a to the left, all other terms to the right
30a=240
a=240/30
a=8
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