6.4(у-12.8)=3.2
6.4у-81.92=3.2
6.4у=3.2+81.92
6.4у=85.12
у=85.12:6.4
у=13.3
3.4х+8.1х-2.3=20.7
11.5х=20.7+2.3
11.5х=23
х=23:11.5
х=2
6,4(y-12,8)=3,2 и 3,4x+8,1x-2,3=20,7
6,4y-81,92=3,2 и 11,5x-2,3=20,7
6,4y=3,2+81,92 и 11,5x=20,7+2,3
6,4y=85,12 и 11,5x=23
y= 85,12:6,4 и x=23:11,5
y=8512:640 и x=230:115
y=13,3 и x=2
6.4(у-12.8)=3.2
6.4у-81.92=3.2
6.4у=3.2+81.92
6.4у=85.12
у=85.12:6.4
у=13.3
3.4х+8.1х-2.3=20.7
11.5х=20.7+2.3
11.5х=23
х=23:11.5
х=2
6,4(y-12,8)=3,2 и 3,4x+8,1x-2,3=20,7
6,4y-81,92=3,2 и 11,5x-2,3=20,7
6,4y=3,2+81,92 и 11,5x=20,7+2,3
6,4y=85,12 и 11,5x=23
y= 85,12:6,4 и x=23:11,5
y=8512:640 и x=230:115
y=13,3 и x=2