45/10 * 7/15х + 45/10 * 2/9 - 77/100 * 8/11х + 77/100 * 3/7 = - 1,75
2,1х + 1 - 0,56х + 0,33 = - 1,75
1,54х = -1,75 - 0,33 - 1
1,54х = - 3,08
х = - 3,08 : 1,54
х = - 2
