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It takes energy to break bonds (positive enthalpy) and releases energy to form bonds (negative enthalpy) and then you add those enthalpies together. You could also do broken-formed but make sure you use bond enthalpies directly.
It helps to remember that atoms are more stable when they form bonds, so forming bonds releases energy (exothermic), while breaking them and returning them to a less stable state requires energy (endothermic).
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