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1). 2×+3Y-4-5y
=2x-2y-4
=2(x-y-2)
2). 9ײ+7׳-8ײ-5׳
=2x³+x²
=x²(2x+1)
3). 7a[1+6] -3b (1+a)
=7a+42a-3b-3ba
=49a-3b-3ba