Crossmark

The surprising obstacle of two unknowns on the same side of the equal sign in solving equations of the type ax ± b ± cx = d and the phenomenon of ignoring the unknown

Crossref DOI link: https://doi.org/10.1007/s10649-025-10445-6

Published Online: 2025-11-19

Published Print: 2026-01

Update policy: https://doi.org/10.1007/springer_crossmark_policy

Authors

Elkjær, Morten https://orcid.org/0000-0001-6035-882X
Kieran, Carolyn https://orcid.org/0000-0002-6193-1330
License Information

Text and Data Mining valid from 2025-11-19

Version of Record valid from 2025-11-19
More Information

Article History

Received: 15 November 2024

Accepted: 20 September 2025

First Online: 19 November 2025

Declarations

: The authors hereby declare that although one of the co-authors is employed by ALINEA, the institution that markets and develops the online learning environment Matematikfessor , from which the data in this article were derived, there are no personal, financial, or other interests that have compromised the impartiality or integrity of this research article. Additionally, ALINEA has no conflict of interest regarding the publication of this research. All analyses and conclusions have been conducted independently and in an objective and scientific manner.

Document is current

Any future updates will be listed below