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yang didalam kurung dikalikan 2
= 8x - 10 - 5x + 7
= 8x - 5x -10 + 7
= 3x -3
5. 9 x⁴y²z² / 3 x²y²z ( kalau pembagian pangkat di kurang)
= 9/3 x⁴⁻² y²⁻² z²⁻¹
= 3 x² z