(3M-2N) - (3M-6N +5)
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(3M-2N)-(3M-6N+5)(3M-2N)-(3M-6N+5)(3M-2N)-(3M-6N+5)(3M-2N)-(3M-6N+5)=3M-2N-3M+6N-5=4N-5
(3M-2N) - (3M-6N +5)
(3M-2N) - (3M-6N +5)
(3M-2N) - (3M-6N +5)
(3M-2N) - (3M-6N +5)= 3M - 2N - 3M + 6N - 5 = 4N -5
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