20a+21-18a=27

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Solution for 20a+21-18a=27 equation: 



20a+21-18a=27

We move all terms to the left:

20a+21-18a-(27)=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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