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2a/5+a=2a-12
We move all terms to the left:
2a/5+a-(2a-12)=0
We add all the numbers together, and all the variables
a+2a/5-(2a-12)=0
We get rid of parentheses
a+2a/5-2a+12=0
We multiply all the terms by the denominator
a*5+2a-2a*5+12*5=0
We add all the numbers together, and all the variables
2a+a*5-2a*5+60=0
Wy multiply elements
2a+5a-10a+60=0
We add all the numbers together, and all the variables
-3a+60=0
We move all terms containing a to the left, all other terms to the right
-3a=-60
a=-60/-3
a=+20
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