$x^2+7x=0$
$500+50-200-100+250$
$-9x\le6$
$x^4+3x^3-5x^2+12x-11$
$\left(ab+5\right)\left(ab-9\right)$
$4x^2-y^2-8x+8=0$
$3^3\cdot3^6\cdot\frac{3^{12}}{3^8}$
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