Simplify –x(6x5)2(–2y6)(y).

Square the factor 6x⁵: (6x⁵)² = 36x¹⁰. Then multiply the coefficients, −1 × 36 × (−2) = 72, and combine like bases: x × x¹⁰ = x¹¹ and y⁶ × y = y⁷. The simplified expression is 72x¹¹y⁷, choice B.

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