12 * (1 3/4 х + 5/8) = 8 1/212 * (7/4х + 5/8) = 17/27/4х + 5/8 = 17/2 : 127/4х + 5/8 = 17/2 * 1/127/4х + 5/8 = 17/247/4х = 17/24 - 5/87/4х = 17/24 - 15/247/4х = 2/247/4х = 1/12х = 1/12 : 7/4х = 1/12 * 4/7х = 1/3 * 1/7
х = 1/21 12 * ( 1 3/4 * 1/21 + 5/8) = 8 1/212 * (7/4 * 1/21 + 5/8) = 17/212 * (1/4 * 1/3 + 5/8) = 17/212 * (1/12 + 5/8) = 17/212 * (2/24 + 15/24) = 17/212 * 17/24 = 17/21/1 * 17/2 = 17/217/2 = 17/28 1/2 = 8 1/2