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144=12a-4
We move all terms to the left:
144-(12a-4)=0
We get rid of parentheses
-12a+4+144=0
We add all the numbers together, and all the variables
-12a+148=0
We move all terms containing a to the left, all other terms to the right
-12a=-148
a=-148/-12
a=12+1/3
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