решите уравнения
1) x^2-5= (x+5)(2x-1)
2) (2x+3)(3x+1)=11x+30
3)2x-(x+1)^2=3x^2-6
4) 6a^2-(a+2)^2= - 4(a-4)
5)x(7-6x)=(1-3x)(1+2x)
6)(5y+2)(y-3)= - 13(2+y)