Question

решите уровнение
(39+x) -84=72

Answer 1

(39+х)-84=72
39+х=72+84
39+х=156
х=156-39
х=117

Answer 2

(39+x)-84=72;
39+x=72+84;
39+x=156;
x=156-39;
x=117

ПРОВЕРКА:

(39+117)-84=156-84= 72