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13 cards from this deck
A mathematical statement that is always true for all variable values
≡\equiv≡ (not ===)
Identity is true for all values; equation only for specific values
Manipulate each side separately; don't use balance method
The more complex side (usually the left-hand side)
2n2n2n
2n+12n + 12n+1 or 2n−12n - 12n−1
3n3n3n
nnn, n+1n + 1n+1, n+2n + 2n+2, ...
2n2n2n, 2n+22n + 22n+2, 2n+42n + 42n+4, ...
2n+12n + 12n+1, 2n+32n + 32n+3, 2n+52n + 52n+5, ...
Yes, always
Always show every line of your working step by step
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