2a=4+20

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Solution for 2a=4+20 equation: 



2a=4+20

We move all terms to the left:

2a-(4+20)=0

We add all the numbers together, and all the variables

2a-24=0

We move all terms containing a to the left, all other terms to the right

2a=24

a=24/2

a=12

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