Ответ:\(0.5x=6\)\(x=6:0.5=12\)\(1.2y=9.6\)\(y=9.6:1.2=8\)\(\frac{x}{0.3}=7\)\(x=7\cdot0.3=2.1\)\(\frac{y}{0.8}=12\)\(y=12\cdot0.8=9.6\)Ответ: x = 12; y = 8; x = 2,1; y = 9,6.