(300*х-72)/7=96+108
(300x -72)/7 = 204
300*x - 72 = 204 * 7
300*x = 1428 + 72
300*x = 1500
x=1500\300
x=5
300x -72/7 = 204 /*7
300x - 72 = 204 * 7
300x = 1428 + 72
300x = 1500 /: 300
x= 5