Ответ:

Пошаговое объяснение:

72/80 - (x - 12/80) = 15/80

72/80 - x + 12/80 = 15/80

84/80 - x = 15/80

x = 84/80 - 15/80

x = 69/80

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x + 7/50 = 3/50 + 27/50

x + 7/50 = 30/50

x = 30/50 - 7/50

x = 23/50

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116/125 - (41/125 + x) = 24/125

116/125 - 41/125 - x = 24/125

75/125 - x = 24/125

x = 75/125 - 24/125

x = 51/125

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4/40 + y + 16/40 = 31/40 + 6/40

20/40 + y = 37/40

y = 37/40 - 20/40

y = 17/40

Ответ:

72/80 - 15/80 = х - 12/80,

47/80 + 12/80 = х,

59/80 = х,

х = 59/80

Пошаговое объяснение: