Toption

(B-S)/T=O

This equation is step to recognize (B-S)/T=O. Please look at change in the trend of form.

①O*T+O=O

②O*T+O=F

③S+O*T=S

④S+S*T=S

⑤S+O*T=B

It is easy to understand S+O*T=B because of ①②③④.

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T=1