$-21-\left(-19\right)$
$2x-11+9x+6.75$
$3m-5<10$
$-\frac{45ab^2}{15ab}$
$5x\le2x+1$
$\csc\left(a\right)-cot\left(a\right)\cos\left(a\right)=\sin\left(a\right)$
$\left(2x+5y\right).\left(2x+3y\right)$
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