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1. (2x^3+x^2-2x-1)/(x^2+4x-5)=0 2. [(2x-3)(x^2-25)]/2x-10=0 3. (x^2+3x)/(x+2)=(4x+12)/(2x+x^2) 4. (x+2x)/(3x-4)=6/5
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