Х+25689=25689-37541
х=25689-25689-37541
х= -37541
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х+(6534+241)=(4173+6534)+241
х=4173+(6534+241)-(6534+241)
х=4173
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6598х=2379×6598
х=2379×6598÷6598
х=2379
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х(25×37)=(42×25)×37
х=(25×37)÷(25×37)×42
х=421
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