(1/3)^x+2+5*(1/3)^x+1-(1/3)^x меньше 7

(1/3)ˣ⁺²+5*(1/3)ˣ⁺¹-(1/3)ˣ<7 (1/3)²*(1/3)ˣ+(5/3)*(1/3)ˣ-(1/3)ˣ<7 (1/9)*(1/3)ˣ+(2/3)*(1/3)ˣ<7 (7/9)*(1/3)ˣ<7   |÷7 (1/9)*(1/3)ˣ<1 (1/3)ˣ<9 (1/3)ˣ<(1/3)⁻² x>-2 Ответ: x∈(-2;+∞).