$x+1^2$
$32-\left(-14+7-4\right)-\left(+4\right)$
$\left(\frac{7}{2}\right)\left(7x\right)$
$\left(+3\right)^{14}\::\:\left(+3\right)^{10}$
$\frac{tan^2\left(x\right)}{sin\left(x\right)}$
$-20y^2+9y+20$
$8a+1<-7$
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