7c(c + 2) - c(7c - 1) < 3 (линейное неравенства)

Question

7c(c + 2) - c(7c - 1) < 3 (линейное неравенства)

Answer 1

7c^2 + 14c - 7c^2 + c < 3
15c < 3
c < 3/15
c < 1/5

c ∈ ( - ∞; 1/5)