140 - Z = 630 : 7
140 - Z = 90
Z = 140 - 90
Z = 50
Проверка
140 - 50 = 630 : 7
90 = 90
ОТВЕТ Z = 50
----------------------------------------------
600 * 20 - N = 60
12000 - N = 60
N = 12000 - 60
N = 11940
Проверка
600 * 20 - 11940 = 60
12000 - 11940 = 60
60 = 60
ОТВЕТ N = 11940
-----------------------------------------------
( 600 - 500 ) : Y = 20
100 : Y = 20
Y = 100 : 20
Y = 5
Проверка
( 600 - 500 ) : 5 = 20
100 : 5 = 20
20 = 20
ОТВЕТ Y = 5
----------------------------------------------------
D : ( 1300 - 800 ) = 4
D : 500 = 4
D = 4 * 500
D = 2000
Проверка
2000 : ( 1300 - 800 ) = 4
2000 : 500 = 4
4 = 4
ОТВЕТ D = 2000