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=(2x.-x)-(2x.-3)-(5.-x)-(5.-3)
=-2x²+6x+5x+15
=-2x²+11x+15
2.a²+2b-3b+7a²-5ab
=(a²+7a²)+(2b-3b)+(-5ab)
=7a⁴-1b-5ab
semoga benar ya jawabanya