$2x^2+3+3x-1$
$-1\frac{2}{1}$
$\left\{-\left[\left(20+4\right).5-8\right].\left(11-18\right)\right\}-\left\{5+\left[3-132:\left(-2\right)\right].7\right\}$
$-7\left(-10+-9u\right)$
$7x^2+13x=5$
$\left(8-2z\right)\left(8+2z\right)$
$2x^2-5x-1$
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