simplifica lo siguiente y posteriormente resuelve 9a-7y+2a²-5a+y-2a+4y+5a²+2a+4y=
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9a-7y+2a^2-5a+y-2a+4y+5a^2+2a+4y
=2a^2+5a^2-7y+y+4y+4y+9a-5a-2a+2a
=2a^2+5a^2-7y+y+4y+4y+9a-5a
=7a^2-7y+y+4y+4y+9a-5a
=7a^2+2y+9a-5a
=7a^2+2y+4a
espero haberte ayudado saludos