Excel in math, science, and engineering

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\(If\quad { a }^{ 3 }+12{ a }^{ 2 }+49a+69=0\\ and\quad { b }^{ 3 }-9{ b }^{ 2 }+28b-31=0,\\ compute\quad a+b.\\ Note:This\quad problem\quad is\quad not\quad original!\quad\)

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