Ответ и Пошаговое объяснение:

y·(36:6) = 42

y·6 = 42

y = 42:6

y = 7.

630:9+a= 240

70+a= 240

a = 240-70

a = 170.

40:5-x = 24

8-x = 24

-x = 24-8

-x = 16

x = -16.

13-6-x = 146

7-x = 146

-x = 146-7

-x = 139

x = -139.

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