$\left(2h+3\right)^2$
$\left(2x-5\right)\left(2x+6\right)$
$n^2-25=0$
$3x-7=11$
$49x^2-36x^2$
$-y^3+y^3$
$\left(\frac{a^3}{2}-x\right)^2$
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