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12a+172=14a+180
We move all terms to the left:
12a+172-(14a+180)=0
We get rid of parentheses
12a-14a-180+172=0
We add all the numbers together, and all the variables
-2a-8=0
We move all terms containing a to the left, all other terms to the right
-2a=8
a=8/-2
a=-4
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