$2a+2=6$
$\left(2x^n-m\right)\left(2x^n+4m\right)$
$3n+3=258$
$\sqrt{144s^2}$
$36h^3k^3+24h^2k^4-60h^2k^3$
$13a\:-\:12b\:-\:15c\:+\:13b\:-\:16a\:+\:19c$
$144 p ^ { 2 } - 900 q ^ { 2 }$
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