$\frac{7\csc\left(-x\right)}{\sec\left(-x\right)}=-7\cot\left(x\right)$
$\left|-28\right|$
$12-\frac{1}{2}\left(2y-6\right)+4y$
$5x-17>-2x+43$
$\left(7g^2+1\right)\left(5g^2-3\right)$
$3x-7y-4z-5z+4y-7x-3y+4z-9x$
$\left(7x-6\right)\left(4x+7\right)$
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