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3b\left(5a+3\right)+5\left(5a+3\right)
Mahia te whakarōpūtanga 15ab+9b+15+25a=\left(15ab+9b\right)+\left(15+25a\right), ka whakatauwehea atu 3b i te tuatahi me 5 i te rōpū tuarua.
\left(5a+3\right)\left(3b+5\right)
Whakatauwehea atu te kīanga pātahi 5a+3 mā te whakamahi i te āhuatanga tātai tohatoha.
15ab+9b+15+25a
Whakareatia te 1 ki te 15, ka 15.