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b. (4y-4x-6) - (3x+y -3) = (4y-y) + (-4x-3x) + (-6-3) = 3y-7x-9
(2x - 4x) + (y + x)
= 2x - 4x + y + x
= 3x - 3y
soal b
(4y - 4x - 6) - (3x + y - 3)
= 4y - 4x - 6 - 3x - y + 3
= 3y -7x - 3