1/2(x-5)-1/7(x+4)=3 Решите уравнение

1/2 * (x - 5) - 1/7 * (x + 4) = 3;

1/2 * x - 1/2 * 5 - 1/7 * x - 1/7 * 4 = 3;

1/2 * x - 1/7 * x = 3 + 1/2 * 5 + 1/7 * 4;

x * (1/2 - 1/7) = 3 + 5/2 + 4/7;

x * (7/14 - 2/14) = 3 * 14/14 + 35/14 + 8/14;

x * 5/14 = (42 + 35 + 8) / 14;

x * 5/14 = 85/14;

x = 85/14 : 5/14;

x = 85/14 * 14/5;

x = 85/5;

x = 17.