Factorise by taking out the common factors: 2(2x-5y)(3x+4y)-6(2x-5y)(x-y)

2(2x-5y)(3x+4y) - 6(2x-5y)(x-y) = 2(2x-5y)[3x+4y - 3(x-y)] = 2(2x-5y)[3x+4y - 3x + 3y] = 14y(2x-5y)