$\frac{1}{2}a+\frac{1}{3}b+2a-3b-\frac{3}{4}a-\frac{1}{6}b-\frac{1}{2}$
$5x-13>-15x+7$
$-3\:-\:\left[-9\right]$
$3x+7.3x-7$
$\sin\left(a\right)=2$
$\int\left(9-y\right)\sqrt[2]{y}dx$
$909.456-6789.31$
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