7m²-{-[m²+3n-5+n-3+m²]}-2n-3
7m²-{-2m2-4n+8}-2n-3
7m²+2m²+4n-8-2n-3
9m²+2n-11
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7m²-{-[m²+3n-5+n-3+m²]}-2n-3
7m²-{-2m2-4n+8}-2n-3
7m²+2m²+4n-8-2n-3
9m²+2n-11
Espero te sirva ☺️