-4х = 64
х = -16
-2(83 - 6х) = -166 + 12х
Подставляем х
-166 + 12 * - 16 = -166 - 192 = -358
Ответ: -358
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Verified answer
-4х = 64
х = -16
-2(83 - 6х) = -166 + 12х
Подставляем х
-166 + 12 * - 16 = -166 - 192 = -358
Ответ: -358