selesaikan setiap persamaan nilai mutlak berikut

|2y + 5| = |7 - 2y|
(2y + 5)² - (7 - 2y)² = 0
12(4y - 2) = 0
y = 1/2

HP = {1/2}

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a² - b² = (a + b)(a - b)