Question

Is 15f+9>5(5f+3) solvable? If so , what are the real numbers?

Answer 1

`15f+9>5(5f+3)\\ 15f+9>25f+15\\ 10f<-6\\ f<-(6)/(10)\\ f<-(3)/(5)`

Answer 2

`15f+9>5(5f+3) \\\\ 15f+9>25f+15 \\\\ 15f-25f>15-9 \\\\ -10f>6 \ |:(-2) \\\\ 5f < 3 \\\\ f<(3)/(5) \\\\ \boxed{f=(-\infty; (3)/(5))}`