$-\frac{4}{7}+\frac{2}{7}x-14x+\frac{4}{7}$
$x^2-6x-18$
$13b+26b^2-39b^3$
$x-y=m$
$\left(-3^2\right)\cdot\left(-4^3\right)$
$732,004+340,6$
$y'+4y=\left(t^2\right)\cdot e^{\left(4t\right)}$
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