$5ab\:-\:3ab^2+6ab-10ab^2-2ab^2$
$0.5+0.6+0.7+0.8$
$-2\left(3x\:-\:4\right)=\:20$
$3z-3\:\le6\:$
$\left(3m-11n\right)\left(3m-11n\right)$
$2z+9x+5z+3x$
$-4\cot\left(x\right)\csc\left(x\right)+7sec\left(x\right)\tan\left(x\right)$
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