а) у² - 144 + 6у² + 144 = 7у²
б) 9 - 12х + 4х² + 9 - 4х² = -12х + 18 = 18 - 12х
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а) у² - 144 + 6у² + 144 = 7у²
б) 9 - 12х + 4х² + 9 - 4х² = -12х + 18 = 18 - 12х