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2a+3=5a-12
We move all terms to the left:
2a+3-(5a-12)=0
We get rid of parentheses
2a-5a+12+3=0
We add all the numbers together, and all the variables
-3a+15=0
We move all terms containing a to the left, all other terms to the right
-3a=-15
a=-15/-3
a=+5
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