ПОМОГИТЕ ПЛИЗ!!! Являются ли уравнения равносильными? Обоснуй ответ.

а) 3х + 4 = 2 и 3х = –2;

б) –3х + 12 + 2х = 4 и 2х + 12 = 3х + 4;

в) 3х - 15 = 0 и 3х = 15;

д) 120х = 10 и 12х = 1
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