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Cross multiplication can only be used when solving equations of the form a/b = c/d, where a, b, c and d are numbers, variables or algebraic expressions. Also, neither denominator can take a value of zero.
When cross-multiplying, the expression a/b = c/d can be re-expressed as ad = bc.
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Earn +20 ptsQ: When cross multiplication can and cannot be correctly used?
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