1) 7(х+8)-25=66;2)9(5х+13)=252;3)15(13x-7)=285;​

Ответ:

Пошаговое объяснение:

1)

7(х+8)-25=66;

7x + 56 - 25 = 66

7x + 31 = 66

7x = 66 - 31

7x = 35

xz = 35 : 7

x = 5

2)

9(5х+13)=252;

45x + 117 = 252

45x = 252 - 117

45x = 135

x = 135 : 45

x = 3

3)

15(13x-7)=285;​

13x - 7 = 285 : 15

13x - 7 = 19

13x = 19 + 7

13x = 26

x = 26 : 13

x = 2

4)

(y + 46) : 3 = 18

y + 46 = 18 * 3

y + 46 = 54

y = 54 - 46

y = 8

5)

(2x + 39) : 5 = 13

2x + 39 = 13 * 5

2x + 39 = 65

2x = 65 - 39

2x = 26

x = 26 : 2

x = 13

6)

182 : ( x - 15) = 14

x - 15 = 182 : 14

x - 15 = 13

x = 13 + 15

x = 28