$-23+678-111+234$
$\frac{\left(a+b\right)^3.\left(a-b\right)^3}{\left(a^2-b^2\right)}$
$6t+5t$
$25x^2+4-20x$
$\left(-32x^2+5x-5\right)+\left(18x^2-3x-5\right)$
$\left(3x^2+4x^2-3x-7\right)$
$2^5+2^6$
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