$79\cdot81$
$9v+5v-9v+3v=8$
$0.35\cdot3.1$
$4c^2+3c^2-4c$
$\sqrt{\sec^2\left(x\right)-1}=\tan\left(x\right)$
$-9+4-1$
$\left(3x^2-5\right)\left(3x^2-8\right)$
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