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Algebra Review
Lesson 4
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Lesson 4: Mixed Algebra Review

Coordinate simplification, substitution, and operation order.

Review problems mix multiple skills. Start with structure recognition, then apply operation rules in the correct sequence.

Key formula

a+bdca+(bd)ca+b\cdot d-c\Rightarrow a+(bd)-c

Worked example

6+678=286+-6\cdot7--8=-28

Checkpoint

Evaluate 2+369\text{Evaluate }-2+3\cdot6-9

Recap

  • - Spot operation precedence before computing.
  • - Rewrite difficult forms into smaller chunks.
  • - Validate by reverse substitution when possible.

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