row reduced augmented matrix calculator - SERP Analysis

https://www.emathhelp.net/calculators/linear-algebra/reduced-row-echelon-form-rref-calculator/

https://raw.org/tool/reduced-row-echelon-form-rref-caclulator/

https://matrix.reshish.com/gauss-jordanElimination.php

http://www.mathaddict.net/rref.htm

https://www.symbolab.com/solver/matrix-row-echelon-calculator

https://www.youtube.com/watch?v=nSEELYEXdfw

https://calculator-online.net/augmented-matrix-calculator/

https://atozmath.com/MatrixEv.aspx?q=reduce

https://www.wolframalpha.com/input/?i=Reduced%2Brow%2Bechelon%2Bform&f1=%7B%7B3%2C%2Bi%2C%2B2%2C3%7D%2C%2B%7B2%2Bi%2C%2B1%2C%2B3%2C1%7D%7D&f=ReducedRowEchelon.theMatrix_%7B%7B3%2C%2Bi%2C%2B2%2C3%7D%2C%2B%7B2%2Bi%2C%2B1%2C%2B3%2C1%7D%7D

https://matrixcalc.org/slu.html