Question

$4x {}^{2} + 9 = 12x$
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Answer 1

$4x {}^{2} + 9 - 12x = 0 \\ 4x {}^{2} - 12x + 9 = 0 \\ (2x - 3) {}^{2} = 0 \\ 2x - 3 = 0 \\ 2x = 3 \\ x = \frac{3}{2}$