1.Решите уравнение: (x^2+2x-15 )\x-1=0

2.Упростите выражение: (2а\(a^2-9))-1\а+3

3.Решите двойное неравенство= -10<3x-4<2
4.Решите систему уравнений: 2x+3y=3
5X+6y=9
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