X x[ y+ (-6)] = [ 13 x z] find the x, y, z
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7abc + (- 5abc) + (9 abc) + (- 8abc)
= 7abc - 5abc + 9abc - 8abc
= (7 - 5 + 9 - 8)abc
= (16 - 13)abc
= 3abc
(ii) 2x²y + (- 4x²y) + 6x²y + (- 5²x)
= 2x²y - 4x²y + 6x²y - 5x²y
= (2 - 4 + 6 - 5)x²y
= (8 - 9)x²y
= -x²y
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