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= (x²+2x-15) / (2x²+13x+15)
= (x²+5x-3x-15) / (2x²+ 10x+3x +15)
= [x(x+5) -3(x+5)] / [2x(x+5) +3(x+5)]
= [(x+5)(x-3)] / [(x+5)(2x+3)]
= x-3/2x+3
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