$25+r=5\left(5-r\right)$
$\frac{x^2+6x+9}{2x+1}$
$\sqrt[4]{81x^8y^6}$
$2\cdot\left(0\right)^3-7\cdot0-2$
$121+22y+y^2$
$8k^3=343m^3$
$-4x^2y+8xy\cdot xy$
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