(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)

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(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)
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(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)
(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)

(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)
(-a^m-1b^n-2+3a^m+1b^n)/(-2a^m-2b^n-2)
=-a^m-2b^n-2(a-3a^3b^2)/(-2a^m-2b^n-2)
=(a-3a^3b^2)/2