a) 2x+2 </ 3x+6-7
2x +2 </ 3x-1
2x-3x </ -1-2
-x </ -3 /*(-1)
x>/ 3
x apartine [3,+infinit)
b) x^2-2x </ 1+x^2-3x
x^2-x^2-2x+3x </ 1
x </ 1
x apartine (-infinit, 1]
c) x^2-x > x^2+2x+11
x^2-x^2-x-2x > 11
-3x > 11 /*(-1)
x < -11/3
x apartine (-infinit, -11/3)
