Помогите срочно
A(a-2)-a^2>5-3a
3x(3x-1)-9x^2<3x+6
5y^2-y(y+4)≧100
7c(c-2)-c(7c+1)<3

a(a-2)-a²>5-3aa²-2a-a²>5-3a-2a+3a>5a>5a∈(5; +∞)3x(3x-1)-9x²<3x+69x²-3x-9x²<3x+6-3x-3x<6-6x<6x>-1x∈(-1; +∞)5y²-5y(y+4)≥1005y²-5y²-20y≥10020y≤-100y≤-5y∈(-∞;  -5]7c(c-2)-c(7c+1)<37c²-14c-7c²-c<3-15c<3c>-3/15c>-1/5c>-0,2c∈(-0,2; +∞)