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6x +5 -3x -6
6x -3x +5 -6
3x -1
b. 6x -5y -2z +(-8x +6y +9z)
6x -5y -2z -8x +6y +9z
6x -8x -5y +6y -2z +9z
-2x +y +7z
c. 3(2x² -4x +5) +2(4x² +3x -7)
6x² -12x +15 +8x² +6x -14
6x² +8x² -12x +6x +15 -14
14x² -6x +1