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= 7x -6y -2z -7x +5y +8z
= 7x -7x -6y +5y -2z +8z
= -y +6z
b. (4x -2y +6) -(4y -2x -3)
= 4x -2y +6 -4y +2x +3
= 4x +2x -2y -4y +6 +3
= 6x -6y +9
Itu jawabannya.
= 7x-7x-6y+6y-2z+8z = 6z
b. (4x-2y+6)-(4y-2x-3) = 4x-2y+6-4y-2x-3
= 4x-2x-2y-4y-6-3 = 2x-6y-9