Ответ:
[tex] \frac{7 + x}{2} = \frac{5 + x}{4} \\ 4(7 + x) = 2(5 + x) \\ 28 + 4x = 10 + 2x \\ 4x - 2x = 10 - 28 \\ 2x = - 18 \\ x = \frac{2}{ - 18} = - 9[/tex]
общий знаменатель 8
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Ответ:
[tex] \frac{7 + x}{2} = \frac{5 + x}{4} \\ 4(7 + x) = 2(5 + x) \\ 28 + 4x = 10 + 2x \\ 4x - 2x = 10 - 28 \\ 2x = - 18 \\ x = \frac{2}{ - 18} = - 9[/tex]
общий знаменатель 8