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2. 5(x+3)/15 + 3(x+5)/15
= 5x + 15/15 + 3x + 15/15
= 8x + 30/15
3. 5(x+4)/x^2+7x+12 - 6(x+3)/x^2+7x+12
= 5x+20/x^2+7x+12 - 6x-18/x^2+7x+12
= -x + 2/x^2+7x+12
2.
3.