(X-3 13/21)+ 2 10/21 =7 2/21

Question

(X-3 13/21)+ 2 10/21 =7 2/21

Answer 1

(Х-3 13\21)+2 10\21 = 7 2\21
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Х-76\21=149\21-52\21
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Х-76\21=97\21
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Х=97\21+76\21
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Х=173\21
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Х=8 5\21
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Вот и всё!