$5b+ba-9a-65b+ba-9a-6$
$x^2\:x\:8x^4$
$\frac{3x-2}{2x^2+4x-6}$
$\left(-5\right)^3.\:\left(5\right)^2.\:3^2$
$-3.5-\left(-2.7\right)$
$log100$
$16a^2-20ab+4b^2$
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