$\left(5a+7a^2b\right)\left(-2a-32\right)$
$u^2-5u+2=0$
$5+\left(-2\right)-\left(-4\right)+15+\left(-2\right)-\left(-8\right)$
$5^{-2-2}$
$3 a + 8 b + 2 - 19 - 8 c - 4$
$2 x ^ { 2 } + 3 x + 1 = 0$
$am-2m+an-2n$
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