(1)(1/2 a-2/3 b)*(2/3 b+1/2 a)(2)(-x-3y)²(3)(3/2 x²+xy-3/5 y²)*(-4/3 x²y²)(4)(a²+9)²-(a+3)*(3-a)*(a²+9)(5)7x(x-1)²-x(2x+5)(2x-5)
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