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6a-12a+10b+8b+6+24=
-6a+18b+30
2). 11x² - 17x + 24 - (2x² +15x+18)=
11x²-17x+24-2x²-15x+18=
11x²-2x²-17x-15x+24+18=
9x²-32x+42
2 soal doang bisanyaa....