1) (a-1)/(2*a+2)+(a+1)/(3-3*a)+(5*a-1)/(3*a^2-3)
2)(2*a+b)/(2*a^2-a*b)-(16*а)/(4*а^2-b^2)+(2*a-b)/(2*a^2+a*b)
3) (y^2-9)/(y^2-6y+9)
4) (b^2-4b+3)/(b^2-9)
5) (z^2-4z-21)/(z^2-6x-7)
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1) (a-1)/(2*a+2)+(a+1)/(3-3*a)+(5*a-1)/(3*a^2-3)
2)(2*a+b)/(2*a^2-a*b)-(16*а)/(4*а^2-b^2)+(2*a-b)/(2*a^2+a*b)
3) (y^2-9)/(y^2-6y+9)
4) (b^2-4b+3)/(b^2-9)
5) (z^2-4z-21)/(z^2-6x-7)
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