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= 9x² -15xy +3x -42xy +6x² -24x
= 9x² +6x -15xy -42xy +3x -24x
= 15x² -57xy -21x
Itu jawabannya.
9x^2-15xy+3x - 42xy+6x^2-24x
15x^2 - 57xy -21x