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\left(6x-7y\right)\left(6x+7y\right)
Tuhia anō te 36x^{2}-49y^{2} hei \left(6x\right)^{2}-\left(7y\right)^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).