спасибо за вопрос

вот мое решение:

а)

(1-4x)/5 = 1

1 - 4x = 5

-4x = 4

x = -1

б)

(3x-10)/2 = -1

3x-10 = -2

3x = 8

x = 8/3 = 2 целых и 2/3

в)

(x+3)/10 = 1/5

x+3 = 2

x = -1

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а)

(8x+3)/7 = (10x-1)/7

8x+3 = 10x-1

-2x = -4

x = 2

б)

(x+2)/5 = (3x-5)/4

(x+2)*4 = (3x-5)*5

4x + 8 = 15x - 25

-11x = -17

x = -17/(-11) = 17/11 = 1 целая и 6/11

в)

(7-x)/6 = (19x-11)/8

(7-x)*8 = (19x-11)*6

56 - 8x = 114x - 66

-122x = -122

x = 1

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Надеюсь помог