$2x\left(x+7\left(x-9\right)\right)-8x\left(x-1\right)$
$3a+5c-9a$
$a^2+15a-16$
$8x^2-18x+4=0$
$\left(\frac{3}{4}m^2y^3+\frac{7}{3}x^2mn\right)^2$
$2.7\cdot\left(3.6+5.6\right)$
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