(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
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(4xˇmyˇn‐8xˇnyˇm)‐(‐5xˇnyˇm‐3xˇmyˇn﹚(4xˇmyˇn‐8xˇnyˇm)‐(‐5xˇnyˇm‐3xˇmyˇn﹚(4xˇmyˇn‐8xˇnyˇm)‐(‐5xˇnyˇm‐
(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
=(4xˇm yˇn‐8xˇn yˇm)+5xˇn yˇm+3xˇm yˇn﹚
=7xˇm yˇn‐3xˇn yˇm
(4x^my^n-8x^ny^m)-(-5x^ny^m-3x^my^n)=(4+3)*x^my^n-(8-5)x^ny^m=7x^my^n-3x^ny^m
(4xˇm yˇn‐8xˇn yˇm)‐(‐5xˇn yˇm‐3xˇm yˇn﹚
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