$\left(5a-7\right)x\left(5a+7\right)$
$\frac{x^4}{-4}+4x^2-16$
$\frac{d^2y}{dx^2}-\frac{10dy}{dx}=-25y$
$\left(-.75\right)+\left(-1.25\right)$
$2+1-14+12$
$2 x ^ { 3 } + 3 x ^ { 2 } - 1$
$\frac{x^3+5x-1}{x+3}$
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