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Tohaina

7x\left(z-3\right)-4\left(z-3\right)
Mahia te whakarōpūtanga 7zx-21x+12-4z=\left(7zx-21x\right)+\left(12-4z\right), ka whakatauwehea atu 7x i te tuatahi me -4 i te rōpū tuarua.
\left(z-3\right)\left(7x-4\right)
Whakatauwehea atu te kīanga pātahi z-3 mā te whakamahi i te āhuatanga tātai tohatoha.