One way would be to solve the two equations. If they have exactly the same solution set, they are equivalent. Otherwise they are not.
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Any equation which does not require you to divide by four, or its equivalent. For example 1600 divided by 5. There is an infinity of such equations.
They are not equivalent sets.
thermochemical equations show the accompanying heat of reaction at constant pressure
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The ancient Romans would instantly recognise IXL (50-11) as the equivalent of 39 because its an abridged version of XXXVIIII (39) The rules governing the original Roman numeral system were changed during the Middle Ages and sill remain as they are today. The equivalent of 39 in Roman numerals today is XXXIX.