1. Среди данных уравнений укажите равносильные:
а) 5х = 15; b) x+6 = 12; с) 47 :х= 8; d) 23 - х= 20.

А) a, b;
В) а, с;
C) b, c;
D) c, d;
E) a, d.​
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