а)(х+15)-8=17
x + 15 – 8 = 17
x = 17 + 8 – 15
x = 10
проверка
(10+15)-8=17
17=17
б) (24-х)-21=10
24 – x – 21 = 10
– x = 10 + 21 – 24
-x = 7
x = -7
(24-(-7))-21=10
10=10
в) (45-у)+18=58
45 – y + 18 = 58
– y = 58 – 18 – 45
-y = -5
y = 5
(45-5)+18=58
58=58
г) (у-35)+12=32
y – 35 + 12 = 32
y = 32 – 12 + 35
y = 55
(55-35)+12=32
32=32
д) 56-(х+12)=24
56 – x – 12 = 24
– x = 24 + 12 – 56
-x = -20
x = 20
56-(20+12)=24
24=24
е) 55-(х-15)=10
55 – x + 15 = 10
– x = 10 – 15 – 55
-x = -60
x = 60
55-(60-15)=10
а)(х+15)-8=17
x + 15 – 8 = 17
x = 17 + 8 – 15
x = 10
проверка
(10+15)-8=17
17=17
б) (24-х)-21=10
24 – x – 21 = 10
– x = 10 + 21 – 24
-x = 7
x = -7
проверка
(24-(-7))-21=10
10=10
в) (45-у)+18=58
45 – y + 18 = 58
– y = 58 – 18 – 45
-y = -5
y = 5
проверка
(45-5)+18=58
58=58
г) (у-35)+12=32
y – 35 + 12 = 32
y = 32 – 12 + 35
y = 55
проверка
(55-35)+12=32
32=32
д) 56-(х+12)=24
56 – x – 12 = 24
– x = 24 + 12 – 56
-x = -20
x = 20
56-(20+12)=24
24=24
е) 55-(х-15)=10
55 – x + 15 = 10
– x = 10 – 15 – 55
-x = -60
x = 60
проверка
55-(60-15)=10
10=10