$8x^{2}+3x^{3}-5x^{2}+7x-9x^{3}-5x$
$\ln\left(x-4\right)+\ln\left(x+1\right)=\ln\left(x+8\right)$
$2g^2-x=10$
$\left(5m^3-\sqrt{2}n\right)^2$
$3x^2-x^2+6x-2$
$\frac{\left(1.\sec x\right)}{\sec x}$
$\frac{x^2+2x+1}{x^2+6x+7}$
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