решите уравнения:(4,2x + 3,1) - (0,7x - 2,7) = 6,85
- (2,5x - 2,5) - (3,1x - 3,1) = - (1,6 - 1,6x)
(3,1x + 3,1) - (1,8x + 1,8) =1,6x + 1,6




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