1. 43,2*(11х/18-7/8) = 216/5 * 11х/18 - 216/5 * 7/8 = 2376х/90 - 1512/40.
2. 25,5*(9х/17-2/3) = 51/2 * 9х/17 - 51/2 * 2/3 = 27х/2 - 17.
3. 2376х/90 - 1512/40 - (27х/2 - 17) = -59,5
4. 2376х/90 - 1215х/90 = 1512/40 - 680/40 - 2380/40
5. 1161х/90 = -1548/40
6. 4644х = -13932
х = -3