Решите б)4,2*(0,8+y)=8,28 в)0,2t+1,7t-0,54=0,22 г)5,6z-2z-0,7z+2,65=7

Б) 4,2*(0,8+y)=8,28 3.36+4.2у=8.28 4.2у=8.28-3.36 4.2у=4.92 у=11 5/7 в)0,2t+1,7t-0,54=0,22 1.9t-0.54=0.22 1.9t=0.76 t=2.5 г)5,6z-2z-0,7z+2,65=7 2.9z+2.65=7 2.9z=7-2.65 2.9z=4.35 z=1.5