$14-\left(-4\right)$
$\left(2x^2y^3+3x^4\right)^2$
$\left(2a-7x\right)\left(2a+7x\right)$
$log\left(x^2-81\right)-1=log\left(x+9\right)$
$\frac{x^2+8-2}{x+3}$
$\frac{\sec\left(0+\frac{\pi}{4}\right)-1}{\tan\left(0+\frac{\pi}{4}\right)}$
$12a^2+30ab$
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