5x-10=3(10-x) пмоогитеее
5Х-10=30-3Х 5Х+3х=30+10 8Х=40 Х=40/8 X=5
5X - 10 = 3 * ( 10 - X ) 5X - 10 = 30 - 3X 5X + 3X = 30 + 10 8X = 40 X = 40 : 8 X = 5