I tried this way, but it doesn't work. I choose 3 volts for Re and quiescent collector current as 0.5 mA. I get then resistance of Re by R = 3V / 0.5 mA and it is 6 Kohm . Then I run simulation for DC equivalent circuit and Remittor has voltage of 14 volts, which is half of the DC voltage supply.I think first I must choose quiescent collector current . Then I must calculate Re resistance, I have already choosen quiescent collector current, so now is only question, what voltage should I apply to it (to emittor resistor) via equation, so at end I get calculated Re.