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= 5y - x - 4 - (5x - 2y + 10)
= 5y - x - 4 - 5x + 2y - 10
= -x - 5x + 5y + 2y - 4 - 10
= -6x + 7y - 14
b. 2(a - 4b + 3) dari 5(2a + 3b - 6)
= (2 × a) (2 × -4b) (2 × 3) dari (5 × 2a) (5 × 3b) (5 × -6)
= 2a - 8b + 6 dari 10a + 15b - 30
= 10a + 15b - 30 - (2a - 8b + 6)
= 10a + 15b - 30 - 2a + 8b - 6
= 10a - 2a + 15b + 8b - 30 - 6
= 8a + 23b - 36
b. 8a + 23b -36