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Explain that this is an algebraic expression. Repeat, introducing: three variables (e.g. a red, blue and white envelope as . x + y + z) multiplication (e.g. two white envelopes as . z + z = 2. z) additional counters (e.g. two blue envelopes, a red envelope and another 6 counters as x + 2y + 6) simplification (e.g. two blue and two white envelopes as . y + z + y + z = 2. y + 2. z) Emphasise the ... ................
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