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= ( 8p + 7 ) - ( 3p - 5 )
= 8p + 7 - 3p + 5
= 8p - 7p + 7 + 5
= p + 12
,
b. (2x - 7y + 4 ) dari ( - 3x + 6y - 1 )
= ( -3x + 6y - 1 ) - ( 2x - 7y + 4 )
= -3x + 6y - 1 - 2x + 7y - 4
= -3x - 2x + 6y + 7y - 1 - 4
= -5x + 13y - 5