1. x : 8 + 7 = 9
x : 8 = 9 - 7
x : 8 = 2
X = 8 * 2
x = 16
2. 14x + 5x = 608
19x = 608
x = 608 : 19
x = 32
3. (x + 7) : 8 = 9
x + 7 = 9 * 8
x + 7 = 72
x = 72 - 7
x = 65
х*(4418-1382)=1518
х*3036=1518
х=1518/3036
х=0,5
136/(х+28)=0,1
х+28=136/0,1
х=1360-28
х=1332