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When the expression

\[1-1x+2x^2-2+3x-3x^2+4-4x+5x^2 - 5x + 6x - 7x^2 + 8x - 9\]

is written in the form $ax^2 +bx+c$, where $a$, $b$, and $c$ are non-zero integers, what is the value of $a + b + c$?

 
 Oct 14, 2021

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