х - 0.5 = 2 (0.3 х - 0.2)

x-0.5=0.6x-0.4домножим на 1010x-5=6x-44x=1x=1/4=0.25Проверим:0.25-0.5=2(0.3*0.25-0.2)-0.25=0.3*0.5-0.4-0.25=0.15-0.40-0.25=-0.25Вроде так.