6. Реши уравнения.
35 + х = 200 - 140
490 -х= 100 - 210
200 +х= 280 + 600
а- (47 - 33) = 310 - 210
у - 230 = 9 - 4 - 640
(230 + 670) - х= 410 - 120​
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