(340+х)-160=840 Помогите

Question

(340+х)-160=840
Помогите

Answer 1

(340 + х) - 160 = 840
340 + х = 840 + 160
340 + х = 1000
х = 1000 - 340
х = 660
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Проверка: (340 + 660) - 160 = 840
                  1000 - 160 = 840
                   840 = 840

Answer 2

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