Sure, I know. Thanks for hitting me twice. Shouldn't have said that. Must wait longer before composing a sentence in English. Actually I meant something like:
I don't know how to obtain _13.5 in my expression.
The _13.5 is the usage from 14 required to reduce b to 0.
+/_10 _12 _13.5
_35.5
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Met vriendelijke groet,
=@@i
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