$7\cos b+9=3\cos b+8$
$5\left(-3x+1\right)$
$\frac{1-\sin\left(x\right)}{\cos\left(x\right)}+\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=2\sec\left(x\right)$
$\left(3a+b\right)\left(3a-b\right)$
$-x^2y+8x^2y$
$\left(7ab^2\right)^6$
$\frac{2x^2-5x-6}{x}$
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