$\left(a^2\cdot a^9\cdot a^5\right)^7$
$3x+12=x-4$
$\left(2x-4\right).\left(2x+49\right)$
$3f\:+\:f\:+\:2f\:-\:8f\:+\:4f\:+\:3f$
$a\left(b+c\right)=ab+ac$
$x^3\:+1;\:x=-1$
$\left(\frac{1}{2}x-2y\right)^3$
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