Final answer to the problem
$3x^{2}$
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Step-by-step Solution
Specify the solving method
1
Simplify the fraction $\frac{12x^3}{4x}$ by $x$
$\frac{12x^{2}}{4}$
2
Take $\frac{12}{4}$ out of the fraction
$3x^{2}$
Final answer to the problem
$3x^{2}$