X+28=48 47-X=30 62-X=41
Х+28=48 х=48-28 х=20 47-х=30 47-30=х х=17 62-х=41 62-41=х х=21
X+28=48 x=48-28 x=20 47-x=30 x=47-30 x=17 62-x=41 x=62-41 x=21