$2+3.\left(-4\right)-\left(-2\right)+2.7\left(-3\right)$
$5x^2y\cdot7xy$
$x^2+6x-18<=0$
$4x^4=100x^2$
$m^2+7+49$
$\left(1-u\right)\sqrt{u}$
$9x^2-1x+36$
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