Ответ:
[tex]y=\frac{128}{7}=18\frac{2}{7}[/tex].
Пошаговое объяснение:
[tex]5-\frac{y}{4}=\frac{3}{7}\\\\28\cdot5-\frac{28\cdot y}{4}=\frac{28\cdot3}{7}\\\\(20+8)\cdot5-(7\cdot y)=4\cdot3\\\\100+40-7y=12\\\\7y=100+40-12\\\\7y=128\\\\y=\frac{128}{7}=18\frac{2}{7}[/tex]
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Ответ:
[tex]y=\frac{128}{7}=18\frac{2}{7}[/tex].
Пошаговое объяснение:
[tex]5-\frac{y}{4}=\frac{3}{7}\\\\28\cdot5-\frac{28\cdot y}{4}=\frac{28\cdot3}{7}\\\\(20+8)\cdot5-(7\cdot y)=4\cdot3\\\\100+40-7y=12\\\\7y=100+40-12\\\\7y=128\\\\y=\frac{128}{7}=18\frac{2}{7}[/tex]