Решите уравнение: 1) (0,2х+0,4х)*3,5=6,3
2) (0,7х-0,2х)*6,4=9,6
3) (х-0,2х):0,4=1,6
4) (0,4х+х):0,7=1,6
Решите пожалуйста))
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