4*(4с-3) - (10с+8) = 16с-12-10с-8=6с-20
еслм с=5/6, то 6*5/6-20= = 5-20=-15
4*(4c-3) - (10c + 8) = 16c - 12 - 10c -8 = 6c - 20
при c = 5/6
6 * 5/6 - 20 = -15
4*(4с-3) - (10с+8) = 16с-12-10с-8=6с-20
еслм с=5/6, то 6*5/6-20= = 5-20=-15
4*(4c-3) - (10c + 8) = 16c - 12 - 10c -8 = 6c - 20
при c = 5/6
6 * 5/6 - 20 = -15