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6x + 1 = (5x² + 6)/2 |* 2
12x + 2 = 5x² + 6
-5x² + 12x - 4 = 0
Δ = 12² - 4 * 4 * 5 = 144 - 80 = 64
√Δ = √64 = 8
x1 = -12 - 8/-10 = -20/-10 = 2
x2 = -12 + 8/-10 = -4/-10 = 2/5