Solving algebra with factorisation
https://www.youtube.com/watch?v=_vubophRGgo
Solving algebra and expansion algebra and factorisation
https://www.youtube.com/watch?v=aeh6zgDTuBE
Cross Multiply
https://www.youtube.com/watch?v=REKcuthHqAU
Simultaneous Equation
https://www.youtube.com/watch?v=6jAT6sG5SEE
Heuristic & Algebra Intensive Revision for Upper Primary
https://www.youtube.com/watch?v=EEClpTL_Mu8
