Помогите пожалуйста: Чи є рiвняння рiвносильним?
1) 8(х-3) =40 i х-3=5
2) 2/3=11 i 2х=33
3) 9(х+2) =18 i х+2=2
4) -3/4=7 i -3х=2
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