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Sätt in minustecken

Att sätta in ett minustecken i en parentes är samma sak som att multiplicera alla termer i parentesen med -1. Alla termer inne i parentesen byter då tecken. Positiva termer blir negativa eftersom (−)⋅(+)=− och negativa termer blir positiva eftersom (−)⋅(−)=+, exempelvis

-(-8+x−6)=8−x+6.

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