If \( [t] \) denotes the greatest integer \( \leq t \), then number of points, at which the func...

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If \( [t] \) denotes the greatest integer \( \leq t \), then number of points, at which the function
\[
f(x)=4|2 x+3|+9\left[x+\frac{1}{2}\right]-12[x+20]
\]
is not differentiable in the open interval \( (-20,20) \), is
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