x^7-x^6 is already in simplest form.
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simplified it would equal: 24x to the third power - x to the second power - x to the sixth power - 34
(x - 2)(x + 2)(x2 - 2x + 4)(x2 + 2x + 4)
x5
Just shift the decimal over to the left six times; 1 x 10 to the minus six becomes 0.000001
x cubed minus 216