$3xy+5x+2+3y+x+4$
$\int_{-\infty}^{-1}e^{-2x}dx$
$\frac{x+2}{\left(2x+4\right)^{-3}}$
$294r^2-150$
$-x^2+2x+11$
$\frac{1}{7}+\frac{6}{7}$
$4-4\left(1+a\right)+\left(1+a\right)^2$
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