Simple but Im stupid

[sponge_designs]

Probably a super simple one but I have


A1 245
A2
A3 8
A4 7
A5 90
A6 15
A7 67
A8 13

A1 being the Total
A2 I want to be the difference whether it be plus or minus of A1 minused A3-A8,
in this case 45 is the answer

Thanks!

[Paul]

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