$34ab+18ab+2ab$
$2-\frac{2}{5}^2+1.2\left(\frac{2}{5}-2\right)$
$3ax-bx$
$\int_0^9\left(7.1e^{-.027x}\right)dx$
$2m^2+3m+1$
$\lim_{x\to\pi}\sec\left(x\right)$
$x^4-4x^3+4x^2-3x+4\left(x-1\right)$
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