Автор - lerochkaaa21pr

6,3 - (3- 2 x) = 20 - (12,4x+1,4)

Ответ

Автор - emb1ty
6,3-(1x)=20-13,8
6,3-1x=6,2
6,2x=6,2
x=6,2:6,2
x=1

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