14(х-30)=630
14х-420=630
14х=1050
х=75
14 (х - 30) = 630
14x – 420 = 630
14x = 630 + 420
14x = 1050
x = 75
Проверка:
14 (75 - 30) =630
630 = 630
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14(х-30)=630
14х-420=630
14х=1050
х=75
14 (х - 30) = 630
14x – 420 = 630
14x = 630 + 420
14x = 1050
x = 75
Проверка:
14 (75 - 30) =630
630 = 630