6,72-12,3x-8,4=9,5x+189,52

6,72 - 12,3x - 8,4 = 9,5x + 189,52;

6,72 - 8,4 - 12,3х = 9,5х + 189,52;

-1,68 - 12,3х = 9,5х + 189,52;

-12,3х - 9,5х = 189,52 + 1,68;

-21,8х = 189,52 + 1,68;

-21,8х = 191,2;

х = 191,2 : (-21,8);

х = -8,7706422.

Проверка:

6,72 - 12,3 * (-8,7706422) - 8,4 = 9,5 * (-8,7706422) + 189,52;

6,72 - (-107,878899) - 8,4 = 9,5 * (-8,7706422) + 189,52;

114,598899 - 8,4 = 9,5 * (-8,7706422) + 189,52;

106,198899 = 9,5 * (-8,7706422) + 189,52;

106,198899 = -83,3211009 + 189,52;

106,198899 = 106,198899.

Ответ: х = -8,7706422.