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13 over 8 plus 12 over 3, I'm assuming?
Well first, you need to find a common denominator... multiply 8 x 3. This gets 24. This is your denominator for both sides.
Multiply the numerator of one of these by the denominator of the other. So 13(3) = 39 and 12(8) = 96. Add these together: 39 + 96 = 135. Put this over your common denominator, 24. 135/24. Simplify. 5 5/8.
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