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x² + 5x = 3/2
(x + 5/2)² = 3/2 + 25/4
(x+5/2)² = 31/4
x+5/2 = 1/2 √31 atau x+5/2 = - 1/2 √31
x = - 5/2 + 1/2 √31 atau x = - 5/2 - 1/2√31
atau
x1 = -1/2(5 -√31) atau x2 = -1/2(5+√31)
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