Пошаговое объяснение:
[tex]21 - 2y5 = y \\ 21 - 10y = y \\ - 10y - y = - 21 \\ - 11y = - 21 \\ y = - 21 \div ( - 11) \\ y = 21 \div 11 \\ y = \frac{21}{11} \\ y = 1 \frac{10}{11} [/tex]
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Пошаговое объяснение:
[tex]21 - 2y5 = y \\ 21 - 10y = y \\ - 10y - y = - 21 \\ - 11y = - 21 \\ y = - 21 \div ( - 11) \\ y = 21 \div 11 \\ y = \frac{21}{11} \\ y = 1 \frac{10}{11} [/tex]