$30+12x-3x^2$
$9x^2-7x\le5+3x+9x^2$
$\frac{9x^2-57x+100}{7x^2-x}$
$2a+\left(-4a\right)$
$cos\left(x\right)y'+sen\left(x\right)=1$
$15\cdot\left(15^{3}\right)^{2}\cdot\left(15^{-5}\right)^{2}$
$-0.23d+d+0.77d$
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