4/5 * (8 - 2 * х) = 0,8 * (х - 1);
Раскроем скобки.
4/5 * 8 - 4/5 * 2 * x = 0.8 * x - 0.8;
6.4 - 1.6 * x = 0.8 * x - 0.8;
-1.6 * x - 0.8 * x = -0.8 - 6.4;
-2.4 * x = -7.2;
24 * x = 72;
12 * x = 36;
x = 36/12;
x = 3.
4/5 * (8 - 2 * х) = 0,8 * (х - 1);
Раскроем скобки.
4/5 * 8 - 4/5 * 2 * x = 0.8 * x - 0.8;
6.4 - 1.6 * x = 0.8 * x - 0.8;
-1.6 * x - 0.8 * x = -0.8 - 6.4;
-2.4 * x = -7.2;
24 * x = 72;
12 * x = 36;
x = 36/12;
x = 3.