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pertama kalikan yg diluar kurung ke dalem kurung
(2 . 3x + 2 . 2y) - (4. x - 4. 5y)
= (6x + 4y) - (4x - 20y)
tinggal kurangin
= 6x + 4y -4x +20y
= 2x + 24y
= 6x + 4y - 4x + 20y
= 6x - 4x + 4y + 20y
= 2x + 24y