5x – [4y - 2{x - y - 4(x - 2y) - 5y} - 2x]
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5x-5y+6 Answer is this
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==> 5x - [4y - 2{x - y - 4(x - 2y) - 5y} - 2x]
==> 5x - [2y{-xy - 4 (-2xy) -5y} -2x]
==> 5x - [-2xy^2 - 8y (-2xy) - 5y} -2x]
==> 10x^2y^2 - 40y (-2xy) -5y} -2x]
==> -30x^2y (-2xy) -5y} -2x]
==> 60x^3y^2 - 5y} -2x
==> 55x^3y - 2x
==> 53x^2y
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