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2.8a+12=72-1.2a
We move all terms to the left:
2.8a+12-(72-1.2a)=0
We add all the numbers together, and all the variables
2.8a-(-1.2a+72)+12=0
We get rid of parentheses
2.8a+1.2a-72+12=0
We add all the numbers together, and all the variables
4a-60=0
We move all terms containing a to the left, all other terms to the right
4a=60
a=60/4
a=15
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