(1,75+х)*7=30,1
12,25 + 7x = 30,1
7x = 30,1 - 12,25
7x = 17,85
x = 2,55
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(1,75+х)*7=30,1
12,25 + 7x = 30,1
7x = 30,1 - 12,25
7x = 17,85
x = 2,55