Решите уравнения: 1)(4х+3)(5-х)-х^2=8х+19 2)9х^2-(7x-2)(x+3)=-12x+1 3)(3x-2)^2-(2x-3)^2+6=7x-5x^2 4)(x-4)^3-x(x^2+39)=-54-10x^2   ^2- во второй степени ^3- в третьей степени  
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