19-a20,a=18

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Solution for 19-a20,a=18 equation: 



19-a20.a=18

We move all terms to the left:

19-a20.a-(18)=0

We add all the numbers together, and all the variables

-a20.a+1=0

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

-a20.a=-1

a=-1/1

a=-1

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