$4.-8\cdot16$
$x^2+2x-25=0$
$x^26x+36$
$-5x+5+9x-1$
$333-14$
$3-5^2+5\left(-5-4\right)$
$x^{\frac{3}{8}}\left(x^{\frac{5}{8}}-8x^{\frac{13}{8}}\right)$
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