813-1205+x-717=605 X ? X?

Question

813-1205+x-717=605
X ?

X?

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Answer 1

813-1205+х=605+717
813-1205+х=1322
1205+х=1322-813
1205+х=509
х=509+1205
х=1714


Проверка:
813-1205+1714-717=605 :)