75 = 5x + 3x + 7x
75 = 15x
x = 5
3x = 15
5x = 25
7x = 35
15 : 25 : 35
Ответ: 15
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75 = 5x + 3x + 7x
75 = 15x
x = 5
3x = 15
5x = 25
7x = 35
15 : 25 : 35
Ответ: 15