$x ^ { 4 } - 5 x ^ { 2 } + 4$
$8d-4c-d$
$5\left(2+7\right)$
$14\left(xz\right)^3+45\left(xz\right)^5$
$x^4-8x^3+18x^2-16x+32$
$-2t+5t$
$\left(8y\right)\left(-4y\right)$
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