1) (7x+139)/13 = 15
7x+139 = 195
7x=195-139
7x=56
x=8
2) 5+(294/(x+8)) = 26
(294/(x+8)) = 21
x+8 = 294/21
x+8=14
x=6
3)(413-x)/12+27 = 60
(413-x)/12 = 60-27
(413-x)/12 = 33
413-x = 396
x=17
4) 41-(216-3x)/34 = 35
(216-3x)/34 = 6
216-3x = 204
3x = 12
x = 4