$2x-5=15$
$\left(8r-12t\right)^2$
$tg\left(270+a\right)=-cotg\left(a\right)$
$17\cdot17\cdot17$
$2\sqrt{75}$
$\left(x+3\right)^2\cdot\left(2x+4\right)^2$
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