$-\frac{224}{8}$
$\left(3x-7\right)\left(4x+7\right)$
$\left(9a^9\right)^2$
$x^2-70x+300$
$-4x+9y=18$
$\int\left(\frac{\left(2x^2+1\right)}{\left(x\right)\sqrt{x^2+1}}\right)dx$
$\sin^2x-3\sin x-4=0$
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