a ppt is here
there is an intention that students start with substitution, including trial and improvement
and then progress to linear equation solving (unknown on both sides)
John Golden has produced some geogebra versions so that the resulting quadrilateral can be viewed for various x values (maybe once the solutions have been ascertained)
related themes are explored in MathsMedicine (professor smudge) - see the various youtube clips on 2D dynamic bar model for an equation e.g. this one
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