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5+3a=12-4a
We move all terms to the left:
5+3a-(12-4a)=0
We add all the numbers together, and all the variables
3a-(-4a+12)+5=0
We get rid of parentheses
3a+4a-12+5=0
We add all the numbers together, and all the variables
7a-7=0
We move all terms containing a to the left, all other terms to the right
7a=7
a=7/7
a=1
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