Gocheva-Ilieva, S.G., Iliev, I.P. and Ivanov, A.V. 2020. ON THE ASSESSMENT OF MATHEMATICAL COMPETENCIES FOR SOLVING NON-LINEAR EQUATIONS . MATTER: International Journal of Science and Technology. 6, 2 (Jul. 2020), 01–14. DOI:https://doi.org/10.20319/mijst.2020.62.0114.