Начнем с открытия скобок:
0.2(3x - 5) - 0.3(x - 1) = -0.7;
0.2 * 3x - 0.2 * 5 - 0.3 * x + 0.3 * 1 = -0.7;
0.6x - 1 - 0.3x + 0.3 = -0.7;
0.6x - 0.3x = 1 - 0.7 - 0.3;
x(0.6 - 0.3) = 0;
0.3x = 0;
x = 0.
Начнем с открытия скобок:
0.2(3x - 5) - 0.3(x - 1) = -0.7;
0.2 * 3x - 0.2 * 5 - 0.3 * x + 0.3 * 1 = -0.7;
0.6x - 1 - 0.3x + 0.3 = -0.7;
0.6x - 0.3x = 1 - 0.7 - 0.3;
x(0.6 - 0.3) = 0;
0.3x = 0;
x = 0.