$3m\:+2n\:=\:16$
$\frac{25x-13x}{5x+25}$
$\left(0.5\cdot1.6\right)+\left(0.5\cdot1.8\right)$
$22-1-3-1-2+5-2-1-2$
$\frac{\cos\left(2x\right)}{\cos\left(x\right)^2+\sin\left(x\right)\cos\left(x\right)}=1-\tan\left(x\right)$
$x^2-14x+42$
$\frac{7^{-3}}{7^{-5}}$
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