$1800\left(1.2\right)-x$
$2a^2+5a+28$
$\left(-0\right)\cdot\left(-346\right)$
$4x-5=4x-1$
$\frac{7}{\frac{t}{11}}$
$x^2+y^2=5$
$\frac{a+1}{2a+3}+\frac{3a+2}{b+1}$
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