$\left(\sqrt{9x+19}-6x-1\right)\left(\sqrt{9x+19}-6x+1\right)$
$w+5x-168=0$
$\int ln\left(x^2+4\right)dx$
$-10x^2+7x+25\ge0$
$a^2b^8-c^4$
$\left(\frac{1}{x}+\frac{1}{y}\right)$
$\frac{\left(15-17\right)\left(-4-6\right)}{\left(-7+5\right)}$
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