$5x^2+4x-8=0$
$\sqrt[1]{-25}$
$15by+4a^2x-5a^2y-12bx$
$81y^2-100$
$\left(-54\right)-\left(-3\right)$
$\left(1+\frac{1}{x}^x\right)$
$\log81=2$
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