6,7*(7,9-y) = 28,81
6,7*7,9-6,7y = 28,81
52,93-6,7y = 28,81
-6,7y = 28,81-52,93
-6,7y = -24,12
6,7y = 24,12
y = 24,12/6,7
y = 3,6
Ответ: 3,6
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6,7*(7,9-y) = 28,81
6,7*7,9-6,7y = 28,81
52,93-6,7y = 28,81
-6,7y = 28,81-52,93
-6,7y = -24,12
6,7y = 24,12
y = 24,12/6,7
y = 3,6
Ответ: 3,6