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6-30a=-12a-12
We move all terms to the left:
6-30a-(-12a-12)=0
We get rid of parentheses
-30a+12a+12+6=0
We add all the numbers together, and all the variables
-18a+18=0
We move all terms containing a to the left, all other terms to the right
-18a=-18
a=-18/-18
a=1
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