$13.9+753$
$9a-12b+2a-11b$
$\left(\frac{3}{5}x^2-\frac{1}{2}\right)\left(\frac{3}{5}x^2+\frac{1}{2}\right)$
$\left(-4\right)^4\left(-4\right)^4\left(-4\right)^4\left(-4\right)^4$
$-10\cdot36+10\cdot25$
$\sqrt { 2 x + 5 } - 4 = 3$
$\frac{32x^2+10-54}{8x\:-\:9}$
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