$6x^2-6\le5x$
$\frac{x^2-7}{x-3}$
$2\left(-2\right)^2+5\left(-1\right)\left(-2\right)+\left(-1\right)^2$
$3x-\left(12x+5x\right)+\left(13x-15\right)-\left(10x-8x+3x\right)$
$35x-9x^2$
$\frac{\sqrt{1+\cot^2\left(x\right)}}{1-\cos^2\left(x\right)}$
$2\ln\left(x-5\right)=\ln\left(x+10\right)+\ln\left(4\right)$
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