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6-30a=-12-12
We move all terms to the left:
6-30a-(-12-12)=0
We add all the numbers together, and all the variables
-30a+6-(-24)=0
We add all the numbers together, and all the variables
-30a+30=0
We move all terms containing a to the left, all other terms to the right
-30a=-30
a=-30/-30
a=1
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