$\left(-19\right)-\left(-4\right)$
$a2+a-7+2a+5$
$\int\frac{2x-3}{x^2-4x+3}dx$
$\left(-2+9y\right)^4$
$\sqrt[7]{33+95}$
$\left(10x^4-5y^3\right)^3$
$20x+4+28x^2$
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