$\left(81a+6m\right)^2$
$a^5-16a^3$
$\frac { 3 x ^ { 4 } - 5 x ^ { 2 } + 2 } { 3 + x ^ { 3 } }$
$\frac{4+2x}{x^2}$
$5x\left(x+2\right)^3-25x^3\left(x+2\right)^2+15x\left(x+2\right)^4$
$k\cdot q\cdot3q$
$-9x-8y-13x-15$
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