(4-a)/12a × a/(a^2-16) = - (a-4)/12a × a/((a-4)(a+4)) = - 1/(12*(a+4)) = - 1/(12a+48)
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(4-a)/12a × a/(a^2-16) = - (a-4)/12a × a/((a-4)(a+4)) = - 1/(12*(a+4)) = - 1/(12a+48)