20a-10a-9a=20

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Solution for 20a-10a-9a=20 equation: 



20a-10a-9a=20

We move all terms to the left:

20a-10a-9a-(20)=0

We add all the numbers together, and all the variables

a-20=0

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

a=20

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