$7x^2-5x-2=0$
$\frac { c } { 20 } \leq 20$
$\left\{-3a+2-4b[2c-3b-\left(3c-1+2a\right)+3]+4b\right\}$
$\int\:\left(x^{4\:}-9x\frac{1}{2}-6\sqrt[3]{x^7}\right)dx$
$5x-4=3x+10$
$\frac{x-4}{2\sqrt{x-4}}$
$3x+4y=18$
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