20a-17a=18

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Solution for 20a-17a=18 equation: 



20a-17a=18

We move all terms to the left:

20a-17a-(18)=0

We add all the numbers together, and all the variables

3a-18=0

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

3a=18

a=18/3

a=6

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