1) (x+15)-8=17x + 15 - 8 = 17x + 7 = 17x = 17 - 7x = 10
Проверка:(10 + 15) - 8 = 1725 - 8 = 1717 = 17 (Верно)
2) (24+x)-21=1024 + x - 21 = 10x + 3 = 10x = 10 - 3x = 7
Проверка:(24 + 7) - 21 = 1031 - 21 = 1010 = 10 (Верно)
3) (45-y)+18=5845 - y + 18 = 58
Проверка:(45 - 5) + 18 = 5840 + 18 = 5858 = 58 (Верно)
4) (y-35)+12=32y - 35 + 12 = 32y - 23 = 32y = 32 + 23y = 55
Проверка:(55 - 35) + 12 = 3220 + 12 = 3232 = 32 (Верно)
5) 55-(x-15)=3055 - (x - 15) = 3055 - x + 15 = 30
Проверка:55 -(40 - 15) = 3055 - 25 = 3030 = 30 (Верно)
1) (x+15)-8=17
x + 15 - 8 = 17
x + 7 = 17
x = 17 - 7
x = 10
Проверка:
(10 + 15) - 8 = 17
25 - 8 = 17
17 = 17 (Верно)
2) (24+x)-21=10
24 + x - 21 = 10
x + 3 = 10
x = 10 - 3
x = 7
Проверка:
(24 + 7) - 21 = 10
31 - 21 = 10
10 = 10 (Верно)
3) (45-y)+18=58
y + 63 = 5845 - y + 18 = 58
-y = 58 - 63
-y = -5
y = 5
Проверка:
(45 - 5) + 18 = 58
40 + 18 = 58
58 = 58 (Верно)
4) (y-35)+12=32
y - 35 + 12 = 32
y - 23 = 32
y = 32 + 23
y = 55
Проверка:
(55 - 35) + 12 = 32
20 + 12 = 32
32 = 32 (Верно)
5) 55-(x-15)=30
x + 70 = 30x = 30 - 70x = -4055 - (x - 15) = 30
55 - x + 15 = 30
x = 40
Проверка:
55 -(40 - 15) = 30
55 - 25 = 30
30 = 30 (Верно)