$1+3+3+1$
$6a-5x-9a+a^2x$
$\left(-5+9\right)-\left(-10-12\right)$
$y^2+6y-8$
$2x^2+7x$
$\left(4m+2n\right)^4$
$\left(x^4\right)^{-5}$
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