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420a=2+60a
We move all terms to the left:
420a-(2+60a)=0
We add all the numbers together, and all the variables
420a-(60a+2)=0
We get rid of parentheses
420a-60a-2=0
We add all the numbers together, and all the variables
360a-2=0
We move all terms containing a to the left, all other terms to the right
360a=2
a=2/360
a=1/180
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