$\left(2n+13\right)\left(2n-13\right)$
$3\cdot\left(1.5\right)^2+3\left(1.5\right)-2$
$7g+-3-2g+4^2$
$100\sin\left(x+y\right)t-100\sin\left(x+y\right)t+500\left(xt\right)$
$\left(6x-5x\right)\left(2b+7a\right)$
$3x^2+7x+2=0$
$256-717\left(\frac{1}{3}\right)$
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