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It seems like the product and reactant enthalpies are negative. And if we're doing products minus reactants the reactants are now a positive value (-products - (-reactants) is the same as reactants - products). Hope that helps
The order in which you add values does not change the final sum. And when you apply a double negative to a value it becomes a positive value. Thus the equation can also be written as (reactants - products) instead of (-products + reactants).
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