$5y^2\cdot3y^3$
$5^2+10x^2$
$x^2-9x+\left(\frac{9}{2}\right)^2$
$-2n-1$
$5a+3b+c+2b+8c+2a$
$\left(x^2+x+2\right)\left(x^2+x-2\right)-\left(x^2+x\right)^2$
$6+8b+6c$
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