What must be subtracted from 13x*x*x+11x*x -9x+16 to get 9x*x*x-2x*x+14x-23
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let x^x^x=a
x^x =b
after subtracting we get
4a+13b-23x+39
so
4x^x^x+13x^x-23x+39
x^x =b
after subtracting we get
4a+13b-23x+39
so
4x^x^x+13x^x-23x+39
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