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10 cards from this deck
Problems with 2 unknowns related in 2 different ways
Define unknown quantities with appropriate variables
Define your variables with units
Check solution by substitution (LHS = RHS)
State answer in words with units and context
Shopping/pricing, geometry, ticket sales
2w+2l=P2w + 2l = P2w+2l=P where www is width, lll is length
Substitute into original equation, check LHS = RHS
Forgetting to define variables before equations
Quantity information and financial information
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