Докажите,что данные уравнения эквиваленты.

1) 2х-1=25-11х и2х+11х=25+1

2)4х-1/6+х/2=1и 4х-1+3х=6

3) (2х-10)(х^2+9)=х(x^2+9)и 2х-10=х
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