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(a - b)(a + b) = a^2 - b^2
(4x)^2 - 2*4x*6 + 36 - 2*( 25 - 49x^2) - (48 - 16x - 18x + 6x^2)=
= 16x^2 - 48x + 36 - 50 + 98x^2 - 48 + 34x - 6x^2 =
= 108x^2 - 14x - 62 = 2* (54x^2 - 7x - 31)