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12=4a-3
We move all terms to the left:
12-(4a-3)=0
We get rid of parentheses
-4a+3+12=0
We add all the numbers together, and all the variables
-4a+15=0
We move all terms containing a to the left, all other terms to the right
-4a=-15
a=-15/-4
a=3+3/4
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