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=6x+5-3x-6
=6x-3x+5-6
=3x-1
b) (6x-5y-2z)+(-8x+6y+9y)
=6x-5y-2z-8x+6y+9y
=6x-8x-5y+6y+9y-2z
=-2x+10y-2z
c)3(2x²-4x+5)+2(4x²+3x-7)
=6x²-12x+15+8x²+6x-14
=6x²+8x²-12x+6x+15-14
=14x²-6x+1