Ответ:

Пошаговое объяснение:

8x + 12 = x + 9

8x - x = 9 - 12

7x = -3

x = -3 : 7

x = -3/7

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15c - 7 = c - 6

15c - c = 7 - 6

14c = 1

x = 1 : 14

c = 1/14

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62 - 13x = 18x

-13x - 18x = -62

-31c = -62

c = 62 : 31

c = 2

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6x + 18 = 5 - x

6x + x = 5 - 18

7x = -13

x = -13 : 7

x = -1 6/7

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19 - 5n = 7 + 3n

-5n - 3n = 7 - 19

-8n = -12

n = 12 : 8

n = 1,5

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51x + 41 = 45 - 51x

51x + 51x = 45 - 41

102x = 4

x = 4 : 102

x = 2/51

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1/2x - 13 = 3/4x + 7

1/2x - 3/4x = 7 + 13

2/4x - 3/4x = 20

-1/4x = 20

x = -20 : 1/4

x = -80

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2/3c - 1,5 = 1/6c + 3,5

2/3c - 1/6c = 3,5 + 1,5

4/6c - 1/6c = 5

1/2c = 5

c = 5 : 1/2

c = 10