Answer
$$x=4,\:x=-\frac{3}{4}$$
Work Step by Step
Solving the equation, we find:
$$ x\left(4x+3\right)-4\left(4x+3\right) \\ \left(4x+3\right)\left(x-4\right) \\ x=4,\:x=-\frac{3}{4}$$
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