Verify: $(6 x^{3} y - 3 x y - 7) - 2 (- 2 x y - 1) = (9 x^{3} y - 2 x y - 13) - (3 x^{3} y - 3 x y - 8) .$

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Solution

$6 x^{3} y - 3 x y - 4 x y - 7 + 2 = 9 x^{3} y - 3 x^{3} y - 2 x y + 3 x y - 13 + 8 6 x^{3} y + x y - 5 = 6 x^{3} y + x y - 5 H e n c e L . H . S . = R . H . S$

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