Question 442829
(-x^2 + 10x -21)/(-3x^2 + 23x -14)
(x-7)(-x+3)/(-3x+2)(x-7)

divide x-7 from both sides

(-x+3)/(-3x+2)
-1(x-3)/ -1(3x-2)

divide -1 from both sides

Final Answer:
(x-3)/(3x-2)