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= 7ab-7bc
2. 6x²-12x+15+8x²+6x-14
=6x²+8x²-12x+6x+15-14
=14x²+6x+1
2. 6x2-12x+15 + (8x2+6x-14) = 14x2-12x+1
semoga membantu maaf kalo ada yg salah