20a-18a-a+3a=9

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Solution for 20a-18a-a+3a=9 equation: 



20a-18a-a+3a=9

We move all terms to the left:

20a-18a-a+3a-(9)=0

We add all the numbers together, and all the variables

4a-9=0

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

4a=9

a=9/4

a=2+1/4

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