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a(8181)=a(8181-1)+a(8181-2)-a(8181-3)
We move all terms to the left:
a(8181)-(a(8181-1)+a(8181-2)-a(8181-3))=0
We add all the numbers together, and all the variables
a8181-(a8180+a8179-a8178)=0
We add all the numbers together, and all the variables
a^8181-(a8180+a8179-a8178)=0
We get rid of parentheses
a^8181-a8180-a8179+a8178=0
We do not support eapression: a^8181
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