$x\left(2x-9\right)=0$
$-12\:+\left\{4-\left[7+\left(\left(-3\right)-2\right)\right]\right\}$
$9x^2-49=0$
$4x+5x+6$
$419,05+1676,2+000,0$
$\left(4-r\right)^2$
$\left(x^7\right)^{-2}$
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