$$(2m+5)(4m-3)a,86$$
$86a\left(4m-3\right)\left(2m+5\right)$
$$86=2\times 43$$
$$86a\left(4m-3\right)\left(2m+5\right)$$
$$688am^{2}+1204am-1290a$$
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$a\left(4m-3\right)\left(2m+5\right),86$
