X + 2015 × 2 ÷ 21 = 200
X+191 целая 19 /21-ых=200 x=8 целых 2 /21-ые
..............Х=84170/21
X + 2015 × 2 ÷ 21 = 200x+4020/21=200 X+191 9/21=200 x=8 12/21
X=8 4/7