150 · x · 3 =3090:30
150 * 3 * x = 450x 3090 / 30 = 103 450x = 103 x = 103/450
150*х*3=3090:30 150х3=3090:30 х=3090*1 ......30*150*3 х=3090 ......13500 х=103 ......450