a)
(x+3)(x-3)+2\leq (x-4)^2-3(1-x)
b)
\frac{2x-1}{2}-\frac{x-8}{3}<x
c)
\frac{2}{3}(x-2)-\frac{3}{4}x>\frac{x-1}{6}+x+4
d)
(x-\sqrt5)(x+\sqrt5)-\frac{1}{2}(2-x^2)\geq x+\frac{3(x-1)^2}{2}
x^2-5-1+\frac{1}{2}x^2\geq x+\frac{3(x^2-2x+1)}{2}/*2
2x^2-12+x^2\geq3(x^2-2x+1)
3x^2-12\geq 2x+3x^2-6x+3
3x^2-12\geq3x^3-4x+3/-3x^2
4x\geq3+12
x\geq\frac{15}{4}
x\geq3\frac{3}{4}
x\in(3\frac{3}{4};+\infty)