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a-2b
4x²+3x - 2(5x-x²)
4x²+3x -10x+ 2x²
4x²+2x²+3x-10x
6x²-7x
4x2+3x - 2 (5x-x2)
4x2+3x -10x+2x2
=6x2-7x atau 6x kuadrat -7x
semoga bermanfaat :)