$5\cdot6+7$
$44rst+40r+7r+3r-50r$
$5x+10y=5$
$x^2-4x-3$
$\left(\frac{1}{2}a^3b+\frac{3}{2}ab^3\right)$
$\left(-70\right)\cdot\left(-7\right)\cdot14$
$5x+5y+5xy$
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