(300*х-72)/7=96+108

(300*х-72)/7=96+108

300x -72/7 = 204 /*7

300x - 72 = 204 * 7

300x = 1428 + 72

300x = 1500 /: 300

x= 5

(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