$x^2+12x-144=0$
$m^2+1=0$
$\frac{x^2+2x}{x^2-6x+9}$
$-30+\left(-10+12\right)$
$a^0x\left(a^2\right)^6$
$15a^2b^3.5a^2\:b^5\cdot$
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