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Please give more details about your question. When you say number, do you mean a number such that a=b=c? Must a,b,c have the same values or can they be different.
_x^4___3x^3__+2x^2 _+ x_- 2__________________
x-3 | x^5 + 0x^4 - 7x^3 - 5x^2 + x - 12
x^5 - 3x^4
----------------
3x^4 - 7x^3
3x^4 - 9x^3
------------------
2x^3 - 5x^2
2x^3 - 6x^2
----------------
x^2 + x
x^2 + 3x
---------------
-2x - 12
-2x + 6
-----------
-18
So your final answer should be x^4 + 3x^3 + 2x^2 + x - 2 - 18/(x-3)
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