$3.2x+19.8=128.6$
$4^{2\left(0\right)}$
$\frac{1-x}{x^2-7^2}$
$x^2+9x-22$
$5^2.5^8$
$\int\left(\frac{x}{\left(x^2-1\right)^2}\right)dx$
$75\:+41$
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