[tex]3(x+3y) + 2x + 5y + 3(x+3y) + 2x +5y\\3x +9y + 2x + 5y + (3x+9y) + 2x + 5y\\5x + 14y + 3x + 9y + 2x + 5y\\10x + 28y\\2(5x + 14y)[/tex]
Espero que te ayude.
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[tex]3(x+3y) + 2x + 5y + 3(x+3y) + 2x +5y\\3x +9y + 2x + 5y + (3x+9y) + 2x + 5y\\5x + 14y + 3x + 9y + 2x + 5y\\10x + 28y\\2(5x + 14y)[/tex]
Espero que te ayude.