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= 6x+5-3x-6
= 3x - 1
b. 5x^2 - 9xy - 4y^2 - (-x^2 + 6xy + 3y^2)
= 5x^2 - 9xy - 4y^2 + x^2 - 6xy - 3y^2
= 6x^2 -13xy - 7y^2
* ^2 maksudnya pangkat dua