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(((x^3-(2*x^2)-(9*x)+18)/(x^2-9))/(x^2-(5*x)+6))/(x+1) = 0;x
x
3*a-(4*b)+3;2*a-(2*b)-c+1;a-b
6-(4*b);c-1;3-(2*b)-c
a-(4*b)+3;1-c;2*a-(2*b)-c+1
231;7
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