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12a+14=7a-25
We move all terms to the left:
12a+14-(7a-25)=0
We get rid of parentheses
12a-7a+25+14=0
We add all the numbers together, and all the variables
5a+39=0
We move all terms containing a to the left, all other terms to the right
5a=-39
a=-39/5
a=-7+4/5
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