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6. simplify x / 7x+x^2
--> 1/7+x where x/= 0,-7
7. simplify -14x^3 / x^3-5x^4
--> -14/1-5x where x /= 1/5, 0
8. x-2 / x^2+4x-12
--> 1/x+6 where x/= -6, 2
9.x^2-3x-10
dont know yet
10. 2/3a * 2/a^2
dont know yet
11. x+2/5x-15 * (10x^2-25x-15)
--> (2x+1)/5(x-3)
12. (x^2-16/x-1)
dont know yet

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for 6-> it would be 1/7 + x^2

thats not one of the choices

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