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12 cards from this deck
Fractions with variables in numerator, denominator, or both
Must have a common denominator first
Find the common denominator (LCM)
Convert each fraction to common denominator
Add/subtract numerators, keep common denominator
Simplify the final answer
(x+3)(x−4)(x+3)(x-4)(x+3)(x−4)
x(x+3)x(x+3)x(x+3)
The denominator
Forgetting to multiply both numerator and denominator
LCD First - Least Common Denominator first
Substitute simple value (e.g. x=1x=1x=1) into both expressions
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